A running back (RB) is a member of the offensive backfield in gridiron football. The primary roles of a running back are to receive handoffs from the quarterback to rush the ball, to line up as a receiver to catch the ball, and block. There are usually one or two running backs on the field for a given play, depending on the offensive formation. A running back may be a halfback, a wingback or a fullback. A running back will sometimes be called a "feature back" if he is the team's starting running back.
A cornerback (CB) is a member of the defensive backfield or secondary in gridiron football. Cornerbacks cover receivers most of the time, but also blitz and defend against such offensive running plays as sweeps and reverses. They create turnovers through hard tackles, interceptions, and deflecting forward passes.
A wide receiver (WR), also referred to as a wideout, formerly a split end, is an eligible receiver in gridiron football. A key skill position of the offense, it gets its name from the player being split out "wide", farthest away from the rest of the offensive formation.
In gridiron football, blitzing is a tactic used by the defense to disrupt pass attempts by the offense. During a blitz, a higher than usual number of defensive players will rush the opposing quarterback, in an attempt either to tackle him or force him to hurry his pass attempt.
Strategy forms a major part of American football. Both teams plan many aspects of their plays (offense) and response to plays (defense), such as what formations they take, who they put on the field, and the roles and instructions each player are given. Throughout a game, each team adapts to the other's apparent strengths and weaknesses, trying various approaches to outmaneuver or overpower their opponent in order to win the game.
The hook and lateral is a trick play in American, Canadian football & indoor American football, often colloquially called the hook and ladder play.
Single set back is an offensive base formation in American Football which requires only one running back lined up about five yards behind the quarterback. There are many variations on single back formations including two tight ends and two wide receivers, one tight end/three wide receivers, etc. The running back can line up directly behind the quarterback or offset either the weak side or the strong side.
A halfback (HB) is an offensive position in American football, whose duties involve lining up in the backfield and carrying the ball on most rushing plays, i.e. a running back. When the principal ball carrier lines up deep in the backfield, and especially when that player is placed behind another player, as in the I formation, that player is instead referred to as a tailback.
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 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. This has resulted in the development of three task-specific "platoons" of players within any single team: the offense, the defense, and the so-called 'special teams'. Within these three separate "platoons", various positions exist depending on the jobs that the players are doing.
A curl route, also called a hitch or hook, is a pattern run by a receiver in American football, where the receiver appears to be running a fly pattern but after a set number of steps or yards will quickly stop and turn around, looking for a pass. This generally works best when the defending corner or safety commits himself to guarding the fly and is unable to stop quickly enough to defend the pass. A "curl out" on the sideline is often referred to as a comeback route.
An out route is a pattern run by a receiver in American football. On an out route, the receiver will start running a fly pattern but, after a certain number of steps, will cut hard 90 degrees "to the outside", or toward the sideline, away from the quarterback. If the cut comes very quickly, usually after only a few steps, it is called a "quick out". Out routes generally allow a one-on-one match-up between the receiver and the defensive back who is guarding him, as safeties generally are concerned with helping out on long routes downfield or the center of the field.
A post is a moderate to deep passing route in American football in which a receiver runs 10–20 yards from the line of scrimmage straight down the field, then cuts toward the middle of the field at a 45-degree angle.
In American football a play is a close to the ground "plan of action" or "strategy" used to move the ball down the field. A play begins at either the snap from the center or at kickoff. Most commonly plays occur at the snap during a down. These plays range from basic to very intricate. Football players keep a record of these plays in their playbook.
Zone coverage is a defense scheme in gridiron football used to protect against the pass.
The following terms are used in American football, both conventional and indoor. Some of these terms are also in use in Canadian football; for a list of terms unique to that code, see Glossary of Canadian football.
A flat route is an American football route, used in passing plays. A flat route is usually run by a running back or a fullback. When run by a receiver it can be known as a speed out or arrow route. The eligible receiver runs parallel to the line of scrimmage till near the sidelines and turns toward the quarterback to wait for the pass. The QB's pass should arrive when he is not yet past the line of scrimmage. The receiver will then turn upfield at the sideline and run straight down the field.
The run and shoot offense is an offensive system for American football which emphasizes receiver motion and on-the-fly adjustments of receivers' routes in response to different defenses. It was conceived by former high school coach Glenn "Tiger" Ellison and refined and popularized by former Portland State offensive coordinator Mouse Davis.
A play calling system in American football is the specific language and methods used to call offensive plays.
A route is a pattern or path that a receiver in gridiron football runs to get open for a forward pass. Routes are usually run by wide receivers, running backs and tight ends, but other positions can act as a receiver given the play.
