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Two-level Defense
In American football, a two-level defense is a defensive formation with only two layers of defense instead of the customary three layers. Overview In a standard three-level defense, there are three layers: the forcing unit (consisting mainly of Lineman (gridiron football), linemen but possibly also including Blitz (gridiron football), blitzing Linebacker, linebackers and Defensive back, defensive backs), the underneath coverage (usually consisting of linebackers but possibly including other players, especially in the case of a zone blitz), and the contain unit (mostly defensive backs). A two-level defense does away with the contain unit in favor of increased pressure on the offense. Two-level defenses will often use one deep safety (as deep as 28 yards at the Snap (gridiron football), snap) to enforce an end line on the offense, but the Bear 4-6 is a two level defense with contain handled solely by the single coverage skills of the Cornerback, cornerbacks. The "Bear" can also funct ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
American Football
American football (referred to simply as football in the United States and Canada), also known as gridiron, is a team sport played by two teams of eleven players on a rectangular field with goalposts at each end. The offense, the team with possession of the oval-shaped football, attempts to advance down the field by running with the ball or passing it, while the defense, the team without possession of the ball, aims to stop the offense's advance and to take control of the ball for themselves. The offense must advance at least ten yards in four downs or plays; if they fail, they turn over the football to the defense, but if they succeed, they are given a new set of four downs to continue the drive. Points are scored primarily by advancing the ball into the opposing team's end zone for a touchdown or kicking the ball through the opponent's goalposts for a field goal. The team with the most points at the end of a game wins. American football evolved in the United States, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lineman (gridiron Football)
In gridiron football, a lineman is a player who specializes in play at the line of scrimmage. The linemen of the team currently in possession of the ball are the offensive line, while linemen on the opposing team are the defensive line. A number of NFL rules specifically address restrictions and requirements for the offensive line, whose job is to help protect the quarterback from getting sacked for a loss, or worse, fumbling. The defensive line is covered by the same rules that apply to all defensive players. Linemen are usually the largest players on the field in both height and weight, since their positions usually require less running and more strength than skill positions. Offensive line The offensive line consists of the center, who is responsible for snapping the ball into play, two guards who flank the center, and two offensive tackles who flank the guards. In addition, a full offensive line may also include a tight end outside one or both of the tackles. An offensi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Blitz (gridiron Football)
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. In practice, a blitz involves five or more players rushing during a single down, rather than the four rushers used during normal play. For example, in a defense that normally uses four defensive linemen to rush, a blitz can be created by adding one or more linebackers or defensive backs. Blitzing is a higher-risk strategy, as fewer defensive players are left to cover receivers or to defend against running plays. However, a successful blitz will result in a sack or will force the quarterback into making an error. The term "blitz" is German for "lightning" and a reference to the blitzkrieg tactic of World War 2. History The “red-dog", likely first completed by Carl Battershell, a MAC footba ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Linebacker
Linebacker (LB) is a playing position in gridiron football. Linebackers are members of the defensive team, and line up three to five yards behind the line of scrimmage and the defensive linemen. They are the "middle ground" of defenders, playing closer to the line of scrimmage than the defensive backs (secondary), but farther back than the defensive linemen. As such, linebackers play a hybrid role and are often the most versatile players on the defensive side of the ball; they can be asked to play roles similar to either a defensive lineman (such as stopping the runner on a running play) or a defensive back (such as dropping back into pass coverage). How a linebacker plays their position depends on the defensive alignment, the philosophy of the coaching staff, and the particular play the offense may call. Linebackers are divided into middle linebackers, sometimes called inside linebackers, and outside linebackers. The middle linebacker, often called "Mike", is frequently ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Defensive Back
In gridiron football, defensive backs (DBs), also called the secondary, are the players on the defensive side of the ball who play farthest back from the line of scrimmage. They are distinguished from the other two sets of defensive players, the defensive linemen who play directly on the line of scrimmage, and the linebackers, who play in the middle of the defense, between the defensive line and the defensive backs. Among the defensive backs, there are two main types, cornerbacks, which play nearer the line of scrimmage and the sideline, whose main role is to cover the opposing team's wide receivers, and the Safety (gridiron football position), safeties, who play further back near the center of the field, and who act as the last line of defense. American defensive formations usually includes two of each, a left and right cornerback, as well as a strong safety and a free safety, with the free safety tending to play further back than the strong safety. In Canadian football, which ha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Zone Blitz
In American football, a zone blitz is a defensive tactic that sends additional players to rush the opposing team's quarterback, whilst also unexpectedly redirecting a supposed pass rushing player into pass coverage instead. This tactic also likely includes zone coverage (rather than man-to-man coverage). Like a conventional blitz, the zone blitz tactic assigns five or more players to rush the quarterback in a single down, rather than the usual four players. However, unlike a conventional blitz, the zone blitz uses players who are initially positioned to rush (for example, the defensive ends) to instead give pass coverage. For example, a zone blitz may involve two linebackers adding to the rush of three defensive linemen, while a fourth lineman unexpectedly moves into pass coverage. As in other blitzes, using additional rushers is intended to hurry the quarterback, and potentially cause an incomplete pass, sack, fumble or interception. Redirecting a player who was expected to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Snap (gridiron Football)
A snap (colloquially called a "hike", "snapback", or "pass from center") is the backward passing of the ball in gridiron football at the start of play from scrimmage. Action The ball begins on the ground with its long axis parallel to the sidelines of the field, its ends marking each team's line of scrimmage in American football; in Canadian football, the line of scrimmage of the team without the ball is 1 yard past their side of the ball. The player snapping the ball (known officially as the "snapper" in rule books) delivers the ball to another player, and that action is the snap. The snapper may hand, throw, or even roll the ball to the other player. The snap must be a quick and continuous movement of the ball by one or both hands of the snapper, and the ball must leave the snapper's hands. The various rules codes have additional requirements, all of which have the effect of requiring the ball to go backward. The snapper almost always passes the ball between his legs, but on ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cornerback
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. Other members of the defensive backfield include strong and free safeties. The cornerback position requires speed, agility, strength, and the ability to make rapid sharp turns. A cornerback's skill set typically requires proficiency in anticipating the quarterback, backpedaling, executing single and zone coverage, disrupting pass routes, block shedding, and tackling. Cornerbacks are among the fastest players on the field. Because of this, they are frequently used as return specialists on punts or kickoffs. Overview The cornerback’s chief responsibility is to defend against the offense's pass. The rules of American professional football and American coll ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Run And Shoot Offense
The run and shoot offense (also known as Run N' Shoot) 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. Description The run and shoot system uses a formation consisting of one running back and usually four wide receivers. This system makes extensive use of receiver motion (having a receiver suddenly change position by running left or right, parallel to the line of scrimmage, just before the ball is snapped), both to create advantageous mismatches with the opposing defensive players and to help reveal what coverage the defense is using. If a defender stays with the motioning receiver, it would imply man-to-man coverage. The basic idea behind the run and shoot is a flexible offense that adjusts "on the fly," wit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
