What is a crack back block?

A crack back block is a blocking technique in American football where a player moves across the formation to block an opponent running parallel to the line of scrimmage. This block is often used to create holes for running backs or to protect the quarterback on a passing play.

Crack back blocks are legal as long as they are executed above the waist and do not target a defenseless player. However, the NFL has implemented rules to protect players from blindside hits, so crack back blocks have become less common in recent years.

Despite the risks involved, crack back blocks are still used in certain offensive schemes to gain an advantage on the field. Coaches often teach players how to properly execute this technique to maximize its effectiveness while minimizing the potential for injury.