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In American football, the specific role that a player takes on the field is referred to as their "position". Under the modern rules of American football, both teams are allowed 11 players [1] on the field at one time and have "unlimited free substitutions", meaning that they may change any number of players during any "dead ball" situation.
In American football, only one offensive player can be in motion at a time, cannot be moving toward the line of scrimmage at the snap, and may not be a player who is on the line of scrimmage. In Canadian football, more than one back can be in motion, and may move in any direction as long as they are behind the line of scrimmage at the snap.
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The following is a list of common and historically significant formations in American football. In football, the formation describes how the players in a team are positioned on the field. Many variations are possible on both sides of the ball, depending on the strategy being employed.
The term "half-back" fell out of use by the early 1970s and "midfield" was used in naming the positions that play around the middle third as in centre midfield and wide midfield. [1] The fluid nature of the modern game means that positions in football are not as rigidly defined as in sports such as rugby or American football. Even so, most ...
American football positions have slowly evolved over the history of the sport. From its origins in early rugby football to the modern game, the names and roles of various positions have changed greatly, some positions no longer exist, and others have been created to fill new roles.
A running back turns up the field in an attempt to reach the end zone.. The halfback (HB) or tailback (TB) position is responsible for carrying the ball on the majority of running plays, and may frequently be used as a receiver on short (or sometimes long, depending on the system) passing plays.
The shotgun formation is a formation used by the offensive team in gridiron football mainly for passing plays, although some teams use it as their base formation. Instead of the quarterback receiving the snap from center at the line of scrimmage , in the shotgun he stands further back, often five to seven yards off the line.