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In American football, blocking or interference (or running interference) involves legal movements in which one player uses his body to obstruct another player's path. The purpose of blocking is to prevent defensive players from tackling the ball carrier, or to protect a quarterback who is attempting to pass, hand off or run the ball.
Some types of block include: a run block, where the blocker pushes a defensive player back and away from the ball carrier; a pass block, where a blocker protects the thrower by moving laterally and backwards to slow or halt an incoming pass rusher; a cut block; a zone block, which is any block executed in a zone blocking scheme; a trap block; a ...
Disadvantages abound in any blitz scheme as well. First, the offensive linemen are usually trained to recognize a blitzing player before the snap of the ball. They communicate with each other at the line of scrimmage using code words that shift the protection to the blitzing player's side, thus strengthening their blocking front.
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.
The drill has several variations. The most common involves two players lined up three yards opposite one another. [3] A corridor is set up typically using three blocking bags on each side of the players lined up top to bottom to create a wall, and the walls are spaced about one yard apart. This creates an area of about three feet by nine feet.
Diagram of an off-tackle play. An off-tackle run in American football is a play in which the running back carries the ball through a running lane off of the tackle's block. The lead block kicks out the end man on the line of scrimmage, and another offensive player usually blocks the linebacker.
In the NFL, blocking below the waist is illegal during kicking plays and after a change of possession. Illegal crackback blocks, peel-back blocks and cut blocks are called during other times when an illegal block is made below the waist. It was during the 1970s that the rules prohibiting these blocks were instituted in various leagues.
In gridiron football, a chop block is an attempt by an offensive player to cut block (block at the thigh level or lower) a defensive player while the defender is already engaged by another offensive player. The chop block is usually considered illegal and penalized by a loss of 15-yards due to the injury risk it presents to the defender.
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