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NCAA
The "crackback" refers to an offensive player who is usually spread out away from the main body of the formation and who runs back in towards the ball at the snap in hopes of blocking a linebacker or defensive backer who is moving towards the blocker but looking into the offensive backfield at the ball carrier such that he does not see the block coming.
If the block is above the waist and not from the back, it is legal. If it is below the waist and the force of the block is back in towards the original position of the ball at the snap, it is illegal.
The block usually occurs on sweeps or option plays to the outside.
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