Now go fight.

A proper collision is not a push or a shove; it is a controlled explosion. Defensive backs are taught to target the "numbers" of the receiver—specifically the sternum. By striking the chest plate, you stop the receiver's forward momentum.

Because Marcus kept his eyes in the backfield while "fighting" the block, he saw the running back cut toward the sideline. He shed Hayes with a final shuck, stepped into the alley, and leveled the runner just as he reached the line of scrimmage.

—a high-risk move used to punish an opponent's attempt to break a combo. Fighting Read: