American Football Stars Navigationsmenü
Die schwarzen NFL-Topspieler haben ein Zeichen gesetzt. Die Stars fordern per Video die stärkste Football-Liga der Welt zu einem Bekenntnis. Den American-Football-Stars reicht es. "Wir werden nicht schweigen!", sagen eineinhalb Dutzend Profis in einem emotionalen Videoclip und. American Football: NFL Stars. Teams. Superbowl Riva-Verlag Der Superbowl ist das größte Einzelsportereignis der Welt. Auch Deutschland hat der Hype. Jetzt gehen Football-Stars die Liga direkt an - ihre Forderungen sind deutlich. - Star-Quarterback der New Orleans Saints muss sich Kritik. American Football: NFL Stars. Teams. Superbowl | Schulz, Markus, Vollmer, Sebastian, Stecker, Jan | ISBN: | Kostenloser Versand für.
Bonner, der wegen seiner Vorliebe für explosive Pässe der»Bomber«hieß, war der höchstrangige Quarterback der AFC, der American Football Conference. Stars. Stadien. Superbowl Daniel Killy. IMPRESSUM SUPER BOWL HALL OF FAME/HALL OF SHAME FOOTBALLABCREKORDE. Den American-Football-Stars reicht es. "Wir werden nicht schweigen!", sagen eineinhalb Dutzend Profis in einem emotionalen Videoclip und. American Football: NFL Stars, Teams, Super Bowl | Schulz, Markus | ISBN: | Kostenloser Versand für alle Bücher mit Versand und. Stars. Stadien. Superbowl Daniel Killy. IMPRESSUM SUPER BOWL HALL OF FAME/HALL OF SHAME FOOTBALLABCREKORDE. players? No.” „Bei NFL-Spielern? Nein.“ Im März distanzierte sich die NFL von Pellman, Casson. Bonner, der wegen seiner Vorliebe für explosive Pässe der»Bomber«hieß, war der höchstrangige Quarterback der AFC, der American Football Conference.
American Football Stars Video
Mit einem davon, habt ihr bestimmt nicht gerechnet! Es brodelt wieder einmal in der Gerüchteküche. Nachdem AB gemeinsam mit Russell Wilson und Lamar Jackson trainiert hat, muss man sich wundern, ob es doch zu einem weiteren Comeback kommt.
Mike Garafolo erklärt die Gründe. Tom Brady dürfte den meisten bekannt sein. Und geben Euch einen Überblick. NFL Ich will meinen Status nutzen und helfen!
Doch wie sieht sie aus, die Patriots-Offense ? Archived from the original on January 23, Retrieved October 19, Archived from the original on December 29, Retrieved December 19, John, Allan December 18, Popular Mechanics.
Archived from the original on December 13, Retrieved November 2, Archived PDF from the original on June 18, Retrieved October 22, Archived from the original on October 21, Archived from the original on November 27, Sports Medicine.
Archived from the original on January 20, Retrieved January 20, Archived from the original on September 15, Retrieved September 2, Time Magazine.
USA Football. Archived from the original on September 25, Retrieved September 20, The Data Disagrees". Archived from the original on February 8, April 30, Archived from the original on June 23, Retrieved September 24, Austin American-Statesman.
Kowall MD, Thor D. Cantu MD, Douglas I. Katz MD, Christine E. Solomon PhD, Michael D. Nowinski PhD, Robert A. Stern PhD, Ann C.
McKee MD, April 30, Oregon Live. Advance Internet. Archived from the original on July 9, Retrieved January 9, Retrieved November 26, South China Morning Post.
Archived from the original on September 29, September 27, Retrieved December 6, The Independent. Archived from the original on November 19, Retrieved November 28, Pittsburgh Post-Gazette.
Archived from the original on October 22, Harris Interactive. January 25, Archived from the original on January 27, Archived from the original on January 18, Archived from the original on November 4, Archived from the original on May 22, Retrieved October 5, Retrieved February 10, Duane January 22, Retrieved February 15, Sports Illustrated.
Retrieved March 25, Archived from the original on October 23, International Business Times. Archived from the original on April 12, Retrieved March 21, June 29, Archived from the original on July 3, Vicksburg Post.
Retrieved August 8, International Federation of American Football. Archived from the original on June 25, Archived from the original on February 4, Retrieved June 18, Archived from the original on April 19, Retrieved April 17, January 16, Archived from the original on April 27, Retrieved April 27, September 17, Archived from the original PDF on April 26, Retrieved April 26, Archived from the original on April 26, Archived from the original on June 18, Los Angeles Times.
ABC News. Archived from the original on May 14, Bah, Humbug". CBS Chicago. Archived from the original on April 29, Retrieved April 28, Archived from the original on December 3, Library of Congress.
Archived from the original on October 16, Retrieved May 2, November 24, Archived from the original on August 7, Retrieved July 20, Archived from the original on May 25, Archived from the original on October 5, Archived from the original on April 18, The Local.
January 27, Retrieved August 3, CNN Travel. Archived from the original on April 17, The Japan Times.
January 3, BBC America. Archived from the original on November 10, Archived from the original on July 5, Retrieved June 19, Archived from the original on June 7, Wait, Don't You Mean Soccer?!
Bleacher Report. April 15, The Rio Times. Folha de S. Paulo in Portuguese. Archived from the original on January 16, Retrieved January 10, CBC Sports.
September 20, Archived from the original on April 20, The Carillon. National Post. Canadian Football League.
January 31, Archived from the original on August 21, Retrieved January 19, The Wall Street Journal. Archived from the original on January 1, Bennett, Tom Colgate, Bob, ed.
Gardener, Robert B.. NFHS Publications. Archived from the original PDF on March 4, Jozsa, Frank P. Ashgate Publishing.
Nelson, David M. December 12, University of Delaware Press. Redding, Rogers — Halpin, Ty ed. Ncaa Water Polo Rules. Smith, Earl, ed. August 11, Sociology of Sport and Social Theory.
Human Kinetics. Vancil, Mark Ed. New York: Hyperion Books. This audio file was created from a revision of the article " American football " dated July 5, , and does not reflect subsequent edits to the article.
Audio help. More spoken articles. American football at Wikipedia's sister projects. International American football. IFAF Africa. IFAF Asia.
IFAF Americas. IFAF Oceania. Gridiron football concepts. Fumble Interception Muffed punt Turnover on downs. First down Three-and-out Fourth down conversion Dead ball.
Timeout Kneel Spike Time warnings 3 min. Clock management Running out the clock Untimed play Garbage time. Two-a-days Oklahoma drill Three-cone drill Film session.
Football codes. Circle rules Gaelic. Association Gridiron American Rugby league Rugby union. American and Canadian American and rugby league American and rugby union Association and futsal Association and rugby union Canadian and rugby league Canadian and rugby union Gaelic and Australian rules Gaelic and rugby union Rugby league and rugby union.
American football card Association football card Australian rules football card. Attempts to ban football games Oldest clubs Oldest competitions.
Team sports. Sport Governing bodies Sportspeople National sport. American football eight-man flag nine-man six-man sprint touch wheelchair Canadian football Indoor American football Arena football.
Rugby league masters mod nines sevens tag wheelchair Rugby union American flag beach mini sevens snow tag Tambo touch tens X Touch Wheelchair.
Ki-o-rahi Jegichagi Yubi lakpi. Top-level American football leagues of Europe. Categories : American football introductions American culture Ball games Football codes Sports originating in the United States Gridiron football.
Die verteidigende Mannschaft Defense , engl. Wenn die Offense einer Mannschaft auf das Feld kommt, hat sie vier Versuche, einen Raumgewinn von zehn Yards oder mehr zu erlangen.
Schafft sie dies, erhält sie vier neue Versuche, gelingt ihr dies nicht oder verliert sie den Ball durch eine Interception oder einen Fumble , geht das Angriffsrecht an den Gegner.
Wenn die Defense die Offense bis in ihre eigene Endzone zurückdrängt und dort den gegnerischen Ballträger tackelt , kann sie einen Safety erzielen.
Gewinner ist die Mannschaft, die nach Ablauf der Spielzeit die meisten Punkte erzielt hat. Grundgedanke des Spiels ist es, Raum zu gewinnen.
Punkte in unterschiedlicher Anzahl können auf verschiedene Weisen erzielt werden. Die Regeln weichen je nach Organisation teilweise voneinander ab.
Punkte können erzielt werden, wenn der Football mittels eines Lauf- oder eines Passspielzugs Run bzw. Pass über die gegnerische Goalline getragen oder in der Endzone gefangen wird.
Dies ist ein Touchdown TD , der sechs Punkte zählt. Touchdowns können auch nach einer Interception oder einem Fumble erzielt werden Defensive Touchdown.
Die Two-Point Conversion hat jedoch geringere Erfolgsaussichten. Falls ein Touchdown nicht mehr erreichbar erscheint, kann ein Kick durch die gegnerischen Torstangen versucht werden Field Goal , der bei Erfolg drei Punkte einbringt.
Darüber hinaus kann die verteidigende Mannschaft einen Safety Zu-Boden-Bringen des ballführenden Spielers in seiner eigenen Endzone erzielen, der der betreffenden Mannschaft zwei Punkte einbringt.
American Football wird als eine Folge von Spielzügen Plays gespielt. Alle aufeinanderfolgenden Plays eines Teams, ohne dass das Angriffsrecht wechselt, nennt man Drive.
Ein Spielzug startet, wenn der Ball gesnapt bewegt wird. Der Offense stehen jeweils vier Versuche Downs zur Verfügung, um mindestens zehn Yards Raumgewinn zu erreichen und damit das Angriffsrecht für weitere vier Versuche zu erhalten neues First Down.
Gelingt ihr dies nicht, muss sie den Ball abgeben, und die andere Mannschaft erhält das Angriffsrecht an der Stelle, an der der Ball am weitesten getragen wurde Turnover on Downs.
Aus diesem Grund wird der vierte Versuch nur selten ausgespielt und stattdessen ein Punt oder Fieldgoalversuch durchgeführt, um dem Gegner nicht mehr Raum zu überlassen als nötig.
Der Quarterback oder ein anderer offensiver Spieler versucht, den Ball einem fangberechtigten Spieler der Offense zuzuwerfen, der eine vorher festgelegte Passroute läuft.
Der Werfer muss sich hinter der Line of Scrimmage befinden. Der Pass kann unvollständig incomplete sein, gefangen Catch oder von der Defense abgefangen Interception werden.
Der nächste Versuch startet auf der Höhe der alten Ballposition. Nach einem Catch darf der Spieler so weit laufen, wie er kann.
Wird er zu Boden gebracht oder verlässt er das Spielfeld, ist der Spielzug beendet. Das nächste Down startet an der Stelle, wo der vorherige Spielzug gestoppt wurde.
Pro Spielzug ist nur ein Vorwärtspass erlaubt. Wird der Quarterback getackelt, bevor er die Line of Scrimmage überquert oder bevor er einen Pass wirft, zählt das als Sack.
Eine besondere Variante des Passspiels ist der Lateralpass. Dabei wird der Ball parallel zur Line of Scrimmage bzw.
Dies darf, ebenso wie sogenannte Handoffs , beliebig oft pro Spielzug wiederholt werden. Des Weiteren ist es dem Quarterback erlaubt, selbst als Ballträger zu fungieren und Raumgewinn zu erzielen Scrambling.
Der Spielzug zählt dann als Laufspielzug. Ballträger sind gewöhnlich Runningbacks, also Halfback und Fullback.
Aber auch jeder andere fangberechtigte Spieler der Offense kann Ballträger sein. Der Ballträger versucht nach Ballerhalt so weit wie möglich in Richtung der gegnerischen Endzone zu kommen, während seine Mitspieler versuchen, die Verteidiger zu blocken , d.
Der Spielzug endet mit einem Tackle, dem Verlassen des Spielfeldes oder, falls es der Ballträger bis in die gegnerische Endzone schafft, mit einem Touchdown.
Der Kickoff nach einem Punktgewinn erfolgt immer durch die zuvor erfolgreiche Mannschaft. Möchte das Kicking-Team den Ball möglichst schnell zurück haben, erfolgt der Kickoff möglichst kurz, um eine bessere Chance zu haben ihn zu erobern Onside Kick.
Gleichzeitig besteht die Gefahr, dass der Gegner den Ball in einer guten Position übernimmt. Um dieses Risiko zu minimieren, kann der Ball auch weit nach hinten geschossen werden, wo das Receiving-Team ihn zurücktragen kann.
Dieser Kick kann ebenfalls von beiden Mannschaften erobert werden. Hierbei wird versucht, ein Field Goal zu erzielen.
Ein Scrimmage Kick ist ein Kickspielzug, der mit einem Snap beginnt. Zumeist wird dieser ausgeführt, wenn nach drei Versuchen absehbar ist, dass der nötige Raumgewinn für ein neues erstes Down nicht erzielt werden kann.
Dann wird der Ball im vierten Versuch in der Regel durch einen sogenannten Punt möglichst weit in Richtung gegnerischer Endzone gekickt, damit der Gegner das Angriffsrecht in einer möglichst schlechten Position übernehmen muss.
Ein Punt kann dabei von der gegnerischen Mannschaft Receiving-Team im Feld gefangen werden und möglichst weit nach vorne getragen werden Punt Return.
Ist man schon nahe beim gegnerischen Tor, versucht man anstelle eines Punts ein Field Goal zu erzielen.
Dabei handelt es sich um eine echte Netto- Spielzeit. Wenn der Ballträger in bounds gestoppt wird, läuft die Uhr weiter. Ein laufender Spielzug wird durch Fouls, Auszeiten oder Ballbesitzwechsel nicht unterbrochen.
Dementsprechend wird die Uhr in solchen Fällen erst nach Beendigung des Spielzugs gestoppt. Ein angefangener Spielzug wird immer fertig gespielt, auch wenn die Spielzeit im jeweiligen Quarter ausgelaufen ist.
Die Uhr wird entweder bei Freigabe des nächsten Spielzuges oder erst beim Snap wieder gestartet.
Daraus ergeben sich je nach Spielsituation gegen Ende des Spiels viele strategische Möglichkeiten. Hat die führende Mannschaft den Ball, kann sie Zeit schinden, indem sie Laufspielzüge ausführt und die Uhr herablaufen lässt.
Im Gegenzug wird das kurz vor Ende zurückliegende Team Pässe nahe der Seitenlinie spielen, um die Uhr möglichst oft anzuhalten.
Sollte nach der regulären Spielzeit ein Punktegleichstand herrschen, folgt eine Overtime.
Zuerst erfolgt der Münzwurf Toss. Der Gewinner entscheidet, ob er angreift Offense oder verteidigt Defense bzw.
Für gewöhnlich wird das Angriffsrecht gewählt. Erzielt jedoch eine Mannschaft einen Touchdown oder ein Safety, gewinnt diese sofort und das Spiel ist beendet.
Sollten nach Ende der 10 Minuten keine Punkte erzielt worden sein oder immer noch Gleichstand bestehen, weil beispielsweise beide Mannschaften in ihrem jeweils ersten Ballbesitz ein Field Goal erzielt haben , so endet das Spiel unentschieden.
In Entscheidungsspielen, z. Sollte dann noch keine Entscheidung gefallen sein, werden solange Overtimes angehängt, bis eine Entscheidung herbeigeführt ist.
Sollte nach einer Overtime Gleichstand herrschen, werden so lange Overtimes angehängt, bis es eine Entscheidung gibt. Ab der dritten Overtime ist ein PAT nicht mehr zulässig.
Nach einem Touchdown muss daher eine Two-Point Conversion gespielt werden. Eine Regelverletzung wird mit einer Strafe engl.
Penalty geahndet. American Football hat eines der umfangreichsten Regelwerke aller Sportarten. Wegen seiner physischen Härte besteht ein hohes Verletzungsrisiko.
Die meisten Regeln dienen daher dazu, Verletzungen der Spieler zu vermeiden. Der Grund ist, dass viele Strafen nicht sofort zur Unterbrechung des Spielzuges führen, sondern erst im Anschluss verhängt werden.
Bei Strafen gegen beide Teams heben diese sich meist gegenseitig auf. Ist die 5-Yard-Strafe nicht mit einem Verlust eines Downs, einem automatischen First Down oder einem Sekunden-Abzug verbunden, so wird sie automatisch verworfen und nur die Yard-Strafe wird vollstreckt.
Das gefoulte Team kann dabei meist entscheiden, ob es die Strafe annimmt der Versuch wird mit dem entsprechenden Raumverlust wiederholt oder ablehnt der nächste Versuch wird ganz normal gespielt.
Wird durch eine Strafe gegen die Defense die Line to Gain die Linie, die die Offense erreichen muss, um vier neue Versuche zu bekommen erreicht, erhält die Offense ein neues First Down.
Einige Strafen beinhalten auch ein automatisches First Down. Die Endzone kann durch Strafen im normalen Spielverlauf nicht erreicht werden.
Ausnahme bildet ein sogenannter Palpably Unfair Act offenkundig unfaires Vorgehen , bei dem es dem Referee, nach Beratung mit seinen Kollegen, erlaubt ist, auch einen Touchdown oder anderen Score als Strafe zu verhängen.
Profispielern, die zukünftig erkranken, hilft der Deal mit der NFL nicht, denn sie spielen nun auf eigenes Risiko. Dezember lehnte der Oberste Gerichtshof Supreme Court eine weitere Berufung ab und machte damit die Einigung rechtskräftig.
Es gibt immer Risiken im Leben. Risiken bleiben selbst dann, wenn man auf dem Sofa sitzt. Zwischen und hatten die 28 NFL-Teams Gehirnerschütterungen bei Spielern gemeldet, das entspricht vier pro Wochenende oder 2,5 pro 1.
Januar In jeder der vier Spielzeiten traten die meisten bei den Cornerbacks auf 26, 23, 24, Demzufolge muss ein Spieler, der auf dem Feld Anzeichen für eine Gehirnerschütterung zeigt, vom Feld genommen und vom medizinischen Team des Clubs untersucht werden.
Nach positiver Diagnose darf er keinen Kontakt zu Pressevertretern haben, bis er wieder medizinisch gesundgesprochen wird.
Wenn ein Kontakt-Sportler nach erlittener Gehirnerschütterung seinen Sport unmittelbar weiter ausübt, so vergeht doppelt so viel Zeit für die Rückbildung seiner Symptome als wenn er sofort vom Spielfeld genommen wird 44 vs.
Treffer innerhalb der Tackle Box fallen nicht unter diese Regel. In den beiden Spielzeiten zuvor hatte er innerhalb 14 Monaten fünf Gehirnerschütterungen erlitten, eine davon in einem Match gegen Maryland.
Für eine Weile war er danach auf der schläfenseitigen Gesichtsfeldhälfte seines linken Auges blind.
Sein Problem erwähnte er akut vor niemandem. Nach einer einzigen, erfolgreichen Saison beendete er seine Karriere frühzeitig, weil er sich nicht weiter dem Risiko von Schädel-Hirn-Traumata und deren Folgen aussetzen wollte.
Lockette musste seine Karriere aufgrund einer Nackenverletzung beenden. Obama sagte: . I think the N. Nach Bekanntwerden der mit American Football zusammenhängenden Gehirnerkrankungen nahm das Interesse an der Sportart auf mehreren Ebenen ab.
Flag Football hat zunehmende Spielerzahlen. Kickoffs und Punts werden abgeschafft, und die Linemen starten aus einer Hockposition anstelle des three-point stances.
With the science available now, we find it surprising anyone would be promoting youth tackle football in any format. Kategorien : American Football Sportmedizin.
Namensräume Artikel Diskussion. Ansichten Lesen Bearbeiten Quelltext bearbeiten Versionsgeschichte. Hauptseite Themenportale Zufälliger Artikel.
American football evolved from the sports of soccer and rugby. Rugby, like American football, is a sport where two competing teams vie for control of a ball, which can be kicked through a set of goalposts or run into the opponent's goal area to score points.
What is considered to be the first American football game was played on November 6, , between Rutgers and Princeton , two college teams.
They consisted of 25 players each and used a round ball that could not be picked up or carried. It could, however, be kicked or batted with the feet, hands, head or sides, with the objective being to advance it into the opponent's goal.
Rutgers won the game 6—4. Representatives of Yale, Columbia , Princeton and Rutgers met on October 19, , to create a standard set of rules for use by all schools.
Harvard abstained from the conference, as they favored a rugby-style game that allowed running with the ball. An Harvard—Yale game played under rugby-style rules was observed by two Princeton athletes who were impressed by it.
They introduced the sport to Princeton, a feat the Professional Football Researchers Association compared to "selling refrigerators to Eskimos ".
Yale player Walter Camp , now regarded as the "Father of American Football",   secured rule changes in that reduced the size of each team from 15 to 11 players and instituted the snap to replace the chaotic and inconsistent scrum.
The introduction of the snap resulted in an unexpected consequence. Prior to the snap, the strategy had been to punt if a scrum resulted in bad field position.
However, a group of Princeton players realized that as the snap was uncontested, they could now hold the ball indefinitely to prevent their opponent from scoring.
In , in a game between Yale and Princeton, both teams used this strategy to maintain their undefeated records. Each team held the ball, gaining no ground, for an entire half, resulting in a 0—0 tie.
This "block game" proved extremely unpopular with both teams' spectators and fans. A rule change was necessary to prevent this strategy from taking hold, and a reversion to the scrum was considered.
However, Camp successfully proposed a rule in that limited each team to three downs , or tackles, to advance the ball 5 yards 4.
Failure to advance the ball the required distance within those three downs would result in control of the ball being forfeited to the other team.
This change effectively made American football a separate sport from rugby, and the resulting five-yard lines added to the field to measure distances made it resemble a gridiron in appearance.
Additionally, tackling below the waist was legalized,  and a static line of scrimmage was instituted. Despite these new rules, football remained a violent sport.
Dangerous mass-formations like the flying wedge resulted in serious injuries and deaths. The legal forward pass was introduced in , although its impact was initially minimal due to the restrictions placed on its use.
The idea of a yard-wider field was opposed by Harvard due to the size of the new Harvard Stadium. To reduce infighting and dirty play between teams, the neutral zone was created along the width of the football before the snap.
This is the first recorded instance of a player being paid to participate in a game of American football , although many athletic clubs in the s offered indirect benefits, such as helping players attain employment, giving out trophies or watches that players could pawn for money, or paying double in expense money.
Despite these extra benefits, the game had a strict sense of amateurism at the time, and direct payment to players was frowned upon, if not prohibited outright.
Over time, professional play became increasingly common, and with it came rising salaries and unpredictable player movement, as well as the illegal payment of college players who were still in school.
The National Football League NFL , a group of professional teams that was originally established in as the American Professional Football Association, aimed to solve these problems.
This new league's stated goals included an end to bidding wars over players, prevention of the use of college players, and abolition of the practice of paying players to leave another team.
The dominant form of football at the time was played at the collegiate level. The game, a 23—17 overtime victory by the Colts, was seen by millions of television viewers and had a major impact on the popularity of the sport.
This, along with the innovations introduced by the new American Football League AFL in the early s, helped football to become the most popular sport in the United States by the mids.
The AFL began in relative obscurity but eventually thrived, with an initial television contract with the ABC television network.
Meanwhile, the AFL introduced many new features to professional football in the United States: official time was kept on a scoreboard clock rather than on a watch in the referee's pocket, as the NFL did; optional two-point conversions by pass or run after touchdowns; names on the jerseys of players; and several others, including expansion of the role of minority players, actively recruited by the league in contrast to the NFL.
The bidding war for players ended in when NFL owners approached the AFL regarding a merger, and the two leagues agreed on one that took full effect in This agreement provided for a common draft that would take place each year, and it instituted an annual World Championship game to be played between the champions of each league.
This championship game began play at the end of the season. Once the merger was completed, it was no longer a championship game between two leagues and reverted to the NFL championship game, which came to be known as the Super Bowl.
College football maintained a tradition of postseason bowl games. Each bowl game was associated with a particular conference and earning a spot in a bowl game was the reward for winning a conference.
This arrangement was profitable, but it tended to prevent the two top-ranked teams from meeting in a true national championship game, as they would normally be committed to the bowl games of their respective conferences.
Several systems have been used since to determine a national champion of college football. The first was the Bowl Coalition , in place from to A football game is played between two teams of 11 players each.
Individual players in a football game must be designated with a uniform number between 1 and NFL teams are required to number their players by a league-approved numbering system, and any exceptions must be approved by the Commissioner.
Although the sport is played almost exclusively by men, women are eligible to play in high school, college, and professional football.
No woman has ever played in the NFL, but women have played in high school and college football games. The role of the offensive unit is to advance the football down the field with the ultimate goal of scoring a touchdown.
The offensive team must line up in a legal formation before they can snap the ball. An offensive formation is considered illegal if there are more than four players in the backfield or fewer than five players numbered 50—79 on the offensive line.
Interior offensive linemen are not allowed to move until the snap of the ball. The quarterback is the leader of the offense.
Either the quarterback or a coach calls the plays. Quarterbacks typically inform the rest of the offense of the play in the huddle before the team lines up.
The quarterback lines up behind the center to take the snap and then hands the ball off, throws it or runs with it.
The primary role of the halfback, also known as the running back or tailback, is to carry the ball on running plays. Halfbacks may also serve as receivers.
Fullbacks tend to be larger than halfbacks and function primarily as blockers, but they are sometimes used as runners in short-yardage situations  and are seldom used in passing situations.
The offensive line OL consists of several players whose primary function is to block members of the defensive line from tackling the ball carrier on running plays or sacking the quarterback on passing plays.
The principal receivers are the wide receivers WR and the tight ends TE. The main goal of the wide receiver is to catch passes thrown by the quarterback,  but they may also function as decoys or as blockers during running plays.
Tight ends line up outside the tackles and function both as receivers and as blockers. The role of the defense is to prevent the offense from scoring by tackling the ball carrier or by forcing turnovers interceptions or fumbles.
Defensive ends line up on the ends of the line, while defensive tackles line up inside, between the defensive ends. The primary responsibilities of defensive ends and defensive tackles are to stop running plays on the outside and inside, respectively, to pressure the quarterback on passing plays, and to occupy the line so that the linebackers can break through.
Linebackers line up behind the defensive line but in front of the defensive backfield. Linebackers are the defensive leaders and call the defensive plays.
Their diverse roles include defending the run, pressuring the quarterback, and guarding backs, wide receivers and tight ends in the passing game.
The defensive backfield , often called the secondary, consists of cornerbacks CB and safeties S. Safeties are themselves divided into free safeties FS and strong safeties SS.
Safeties line up between the cornerbacks but farther back in the secondary. Safeties are the last line of defense and are responsible for stopping deep passing plays as well as running plays.
The special teams unit is responsible for all kicking plays. The special teams unit of the team in control of the ball tries to execute field goal FG attempts, punts and kickoffs , while the opposing team's unit will aim to block or return them.
The long snapper's job is to snap the football to the holder, who will catch and position it for the placekicker. There is not usually a holder on kickoffs, because the ball is kicked off a tee; however, a holder may be used in certain situations, such as if wind is preventing the ball from remaining upright on the tee.
The player on the receiving team who catches the ball is known as the kickoff returner KR. The positions specific to punt plays are the punter P , long snapper, upback and gunner.
The long snapper snaps the football directly to the punter, who then drops and kicks it before it hits the ground. Gunners line up split outside the line and race down the field, aiming to tackle the punt returner PR —the player who catches the punt.
Upbacks line up a short distance behind the line of scrimmage, providing additional protection to the punter. In football, the winner is the team that has scored more points at the end of the game.
There are multiple ways to score in a football game. The touchdown TD , worth six points, is the most valuable scoring play in American football.
A touchdown is scored when a live ball is advanced into, caught in, or recovered in the opposing team's end zone. A PAT is most commonly attempted from the two- or three-yard line, depending on the level of play.
If a PAT is scored by a placekick or dropkick through the goal posts, it is worth one point, typically called the extra point.
If it is scored by what would normally be a touchdown it is worth two points, typically called the two-point conversion.
In general, the extra point is almost always successful while the two-point conversion is a much riskier play with a higher probability of failure; accordingly, extra point attempts are far more common than two-point conversion attempts.
A field goal FG , worth three points, is scored when the ball is placekicked or dropkicked through the uprights and over the crossbars of the defense's goalposts.
A safety is scored when the ball carrier is tackled in their own end zone. Safeties are worth two points, which are awarded to the defense.
Lines marked along the ends and sides of the field are known as the end lines and sidelines. Goal lines are marked 10 yards 9. Weighted pylons are placed the sidelines on the inside corner of the intersections with the goal lines and end lines.
White markings on the field identify the distance from the end zone. Inbound lines, or hash marks , are short parallel lines that mark off 1-yard 0.
Yard lines , which can run the width of the field, are marked every 5 yards 4. A one-yard-wide line is placed at each end of the field; this line is marked at the center of the two-yard line in professional play and at the three-yard line in college play.
Numerals that display the distance from the closest goal line in yards are placed on both sides of the field every ten yards.
Goalposts are located at the center of the plane of the two end lines. The crossbar of these posts is 10 feet 3.
Goal posts are padded at the base, and orange ribbons are normally placed at the tip of each upright as indicators of wind strength and direction.
The football itself is an oval ball, similar to the balls used in rugby or Australian rules football. Football games last for a total of 60 minutes in professional and college play and are divided into two halves of 30 minutes and four quarters of 15 minutes.
The visiting team can call either "heads" or "tails"; the winner of the toss chooses whether to receive or kick off the ball or which goal they wish to defend.
They can defer their choice until the second half. Unless the winning team decides to defer, the losing team chooses the option the winning team did not select—to receive, kick, or select a goal to defend to begin the second half.
Most teams choose to receive or defer, because choosing to kick the ball to start the game allows the other team to choose which goal to defend.
Games last longer than their defined length due to play stoppages—the average NFL game lasts slightly over three hours.
An operator is responsible for starting, stopping and operating the game clock based on the direction of the appropriate official.
If the play clock expires before the ball has been snapped or free-kicked, a delay of game foul is called on the offense.
The play clock is set 25 seconds after certain administrative stoppages in play and to 40 seconds when play is proceeding without such stoppages.
There are two main ways the offense can advance the ball: running and passing. In a typical play, the center passes the ball backwards and between their legs to the quarterback in a process known as the snap.
The quarterback then either hands the ball off to a back, throws the ball, or runs with it. The play ends when the player with the ball is tackled or goes out-of-bounds or a pass hits the ground without a player having caught it.
A forward pass can be legally attempted only if the passer is behind the line of scrimmage; only one forward pass can be attempted per down.
The offense is given a series of four plays, known as downs. If the offense advances ten or more yards in the four downs, they are awarded a new set of four downs.
If they fail to advance ten yards, possession of the football is turned over to the defense. In most situations, if the offense reaches their fourth down they will punt the ball to the other team, which forces them to begin their drive from farther down the field; if they are in field goal range , they might attempt to score a field goal instead.
There are two categories of kicks in football: scrimmage kicks, which can be executed by the offensive team on any down from behind or on the line of scrimmage,    and free kicks.
On a kickoff, the ball is placed at the yard line of the kicking team in professional and college play and at the yard line in high school play.
The ball may be drop-kicked or place-kicked. If a place kick is chosen, the ball can be placed on the ground or a tee; a holder may be used in either case.
On a safety kick, the kicking team kicks the ball from their own yard line. They can punt, drop-kick or place-kick the ball, but a tee may not be used in professional play.
Any member of the receiving team may catch or advance the ball. The ball may be recovered by the kicking team once it has gone at least ten yards and has touched the ground or has been touched by any member of the receiving team.
The three types of scrimmage kicks are place kicks, drop kicks, and punts. Only place kicks and drop kicks can score points.
If it is touched or recovered by the kicking team beyond this line, it becomes dead at the spot where it was touched.
The receiving team has the option of signaling for a fair catch , which prohibits the defense from blocking into or tackling the receiver.
The play ends as soon as the ball is caught and the ball may not be advanced. Officials are responsible for enforcing game rules and monitoring the clock.
All officials carry a whistle and wear black-and-white striped shirts and black hats except for the referee, whose hat is white.
Each carries a weighted yellow flag that is thrown to the ground to signal that a foul has been called.
An official who spots multiple fouls will throw their hat as a secondary signal. Another set of officials, the chain crew , are responsible for moving the chains.
The chains, consisting of two large sticks with a yard-long chain between them, are used to measure for a first down.
The chain crew stays on the sidelines during the game, but if requested by the officials they will briefly bring the chains on to the field to measure.
A typical chain crew will have at least three people—two members of the chain crew will hold either of the two sticks, while a third will hold the down marker.
The down marker, a large stick with a dial on it, is flipped after each play to indicate the current down and is typically moved to the approximate spot of the ball.
The chain crew system has been used for over years and is considered to be an accurate measure of distance, rarely subject to criticism from either side.
Football is a full-contact sport, and injuries are relatively common. Most injuries occur during training sessions, particularly ones that involve contact between players.
At a minimum players must wear a football helmet and a set of shoulder pads , but individual leagues may require additional padding such as thigh pads and guards, knee pads, chest protectors, and mouthguards.
The most common types of injuries are strains , sprains , bruises , fractures, dislocations , and concussions. Repeated concussions and possibly sub-concussive head impacts  can increase a person's risk in later life for CTE chronic traumatic encephalopathy and mental health issues such as dementia , Parkinson's disease , and depression.
A study performed by the VA Boston Healthcare System and the Boston University School of Medicine found that tackle football before age 12 was correlated with earlier onset of symptoms of CTE, but not with symptom severity.
More specifically, each year a player played tackle football under age 12 predicted earlier onset of cognitive, behavioral, and mood problems by an average of two and a half years.
College football is the third-most popular sport in the United States, behind professional baseball and professional football.
High school football is the most popular sport in the United States played by boys; over 1. The NFHS is the largest organization for high school football, with member associations in all 50 states as well as the District of Columbia.
USA Football is the governing body for youth and amateur football,  and Pop Warner Little Scholars is the largest organization for youth football.
Several professional football leagues have been formed outside the auspices of the NFL. One such league, the XFL , is currently operating as of Other attempts to start rival leagues since the AFL merged with the NFL in have been far less successful, as professional football salaries and the NFL's television contracts began to escalate out of the reach of competitors and the NFL covered more of the larger cities.
The World Football League WFL played for two seasons, in and , but faced such severe monetary issues it could not pay its players.
In its second and final season the WFL attempted to establish a stable credit rating, but the league disbanded before the season could be completed.
Originally not intended as a rival league, the entry of owners who sought marquee talent and to challenge the NFL led to an escalation in salaries and ensuing financial losses.
Despite television contracts with NBC and UPN , and high expectations, the XFL suffered from low quality of play and poor reception for its use of tawdry professional wrestling gimmicks , which caused initially high ratings and attendance to collapse.
The United Football League UFL began in but folded after suspending its season amid declining interest and lack of major television coverage.
American football leagues exist throughout the world, but the game has yet to achieve the international success and popularity of baseball and basketball.
These countries rank far below the United States, which is dominant at the international level. The league operates in a promotion and relegation structure with German Football League 2 GFL2 , which also has 16 teams.
The competition is contested between the top six European teams. American football federations are present in Africa , the Americas , Asia , Europe and Oceania ; a total of 64 national football federations exist as of July These include the predominant participation of men in international play and the short three-week Olympic schedule.
Large team sizes are an additional difficulty, due to the Olympics' set limit of 10, athletes and coaches.
American football also has an issue with a lack of global visibility. Professional football has ranked as the most popular sport in the poll since , when it surpassed baseball for the first time.
In a study, the NCAA estimated there were around 1. American football also plays a significant role in American culture. The day on which the Super Bowl is held is considered a de facto national holiday ,  and in parts of the country like Texas , the sport has been compared to a religion.
Merit is rewarded, not punished. Masculinity is celebrated, not feminized. People of various beliefs and backgrounds — a melting pot, if you will — must unify for a common goal for the team to be successful".
The safety of the sport has also sparked national controversy in American popular culture. It is often received as "overly aggressive", and defamiliarized in popular culture.
Bennet Omalu , a neuropathologist who was the first to discover and publish findings of chronic traumatic encephalopathy or CTE. In Canada, the game has a significant following.
It was the second-most popular sport in Mexico in the s, with the game being particularly popular in colleges. Japan was introduced to the sport in by Paul Rusch , a teacher and Christian missionary who helped to establish football teams at three universities in Tokyo.
Play was halted during World War II, but the sport began growing in popularity again after the war. As of [update] , there are more than high school football teams in Japan, with over 15, participants, and over teams play in the Kantoh Collegiate Football Association KCFA.
Europe is a major target for the expansion of the game by football organizers. In the United Kingdom in the s, the sport was popular, with the Super Bowl being watched by over four million people about 1 out of every 14 Britons.
Its popularity faded during the s, coinciding with the establishment of the Premier League —top level of the English football league system.
According to BBC America , there is a "social stigma" surrounding American football in the UK, with many Brits feeling the sport has no right to call itself "football" due to the lack of emphasis on kicking.
Super Bowl viewership has also rebounded, with over 4. In Brazil , football is a growing sport. It was generally unknown there until the s when a small group of players began playing on Copacabana Beach in Rio de Janeiro.
The sport grew gradually with amateur players registering within 20 years. Games were played on the beach with modified rules and without the traditional football equipment due to its lack of availability in Brazil.
Eventually, a tournament, the Carioca championship, was founded, with the championship Carioca Bowl played to determine a league champion.
The country saw its first full-pad game of football in October The sport's increase in popularity has been attributed to games aired on ESPN , which began airing in Brazil in with Portuguese commentary.
The network, along with Esporte Interativo , airs games there on cable television. Football is often associated in Brazil as being the sport of supermodel Gisele Bündchen 's husband Tom Brady.
The NFL has expressed interest in having games in the country, and the Super Bowl has become a widely watched event in Brazil at bars and movie theaters.
Canadian football , the predominant form of football in Canada, is closely related to American football—both sports developed from rugby and are considered to be the chief variants of gridiron football.
Indoor football leagues constitute what The New York Times writer Mike Tanier described as the "most minor of minor leagues.
The Indoor Football League is an example of a prominent indoor league. There are several non-contact variants of football like flag football.
Depending on the rules used, a game of touch football may require the player be touched with either one or two hands to be considered down.
From Wikipedia, the free encyclopedia. Team field sport. This article is about the American variation of gridiron football.
For other uses, see American football disambiguation. Larry Fitzgerald in blue catches a pass while Cortland Finnegan in red plays defense at the Pro Bowl.
Football gridiron. Team sport ball game. Football Football helmet Pads shoulder and knee. Main article: Football word.
Main article: History of American football. Main article: American football positions. Main article: American football rules.
Main article: American football field. See also: Official American football , Chain crew , and Penalty gridiron football. See also: Protective equipment in gridiron football and Health issues in American football.
Main article: American football in the United States. See also: Canadian football , Arena football , and Flag football.
American football portal. American football strategy Comparison of American football and rugby union Comparison of American football and rugby league Fantasy football American List of American football players List of American football stadiums by capacity List of leagues of American and Canadian football Steroid use in American football.
Pro Football Talk. NBC Sports. Archived from the original on December 30, Retrieved January 14, Britannica Online Encyclopedia.
Archived from the original on June 14, Retrieved July 13, What's In A Name? Retrieved April 19, BBC News. Archived from the original on June 9, Retrieved June 28, Australian Broadcasting Company.
Archived from the original on October 28, September Archived from the original on March 1, Rutgers University. Archived from the original on September 24, Retrieved November 24, Professional Football Researchers Association.
Archived PDF from the original on April 2, Archived from the original on October 9, Retrieved October 8, Archived from the original on June 29, Archived PDF from the original on January 18, Archived from the original on January 2, New England Historical Society.
Archived from the original on October 26, Retrieved January 3, As a senior at Yale, Camp prevailed at Massasoit House and cut the number of players to 11 from That year  he also came up with the idea for a static line of scrimmage.
The Research Quarterly. National Collegiate Athletic Association. Archived from the original on April 30, New York Times.
Retrieved April 12,