There can be two separate lines of offensive and defensive players entering the drill from up near the rag line, alternating from side to side each time through the drill.  Otherwise players can first play offense; the other side takes their turn; they play defense, then exit the drill. 

Variation #2 (15 min):  "Pick & Pop."  Same set up as the above variation except a second offensive and defensive player is added at both crease positions (initially marked by a pylon).  As the high defender begins to force the ball carrier underneath, the crease player clears out of the crease and "pops" up into the shooter position.

The low defender must hold their position until the ball carrier runs to a bad angle, at which point the ball carrier throws a flip pass to the player up in the shooter position, and the low defender attempts to close the gap without giving up a shot.  To start the drill offensive players only have this "one opportunity" to get off a shot (Variation #2A), whereas the pylons can later be removed and offensive players are allowed to continue "re-picking" and playing offense for up to 10 seconds (Variation #2B).