Players pair up (offense in front of the defense).
Offensive players 1 and 2 and jog up court.
Defensive players follow and run past their partner, making a slash arm and blocking out. Roles are then reversed as the players run full court.

Hint:
The offensive players being blocked out should push the defender in the back simulating a game like situation.

Emphasize:
Defenders must keep arms up (show 2 "L's" with your arms)
Defenders must keep a wide stance and stay down