If someone dives at you, you have full control of their tackle. Rory, when you see them getting ready to dive, or as they are diving, put the ball in the arm facing away from them, and get in a sort of line backer stance. When they dive, take your free hand, and shove the top of their helmet to the ground. After you do this, keep running, and make sure you make a quick cut away from his body to keep the play moving.

Pro tip from the middle line backer and fullback of my schools football team.