The defender passes to the attacker and must touch him on the waist (forces you to get down). Two-dribble limit, play until a score by either player (both can rebound a miss, teaches offensive rebounding), make-it, take-it. The defender must touch the attacker each time.
On a close-out, run at his number, outside leg up, split him in half, send him baseline.
If a ballhandler with a live dribble picks up the ball above his number, get right in there, jam and make him turn his shoulder, he can't dribble from there.
Challenge every shot, go up with him, box out (step through then reverse pivot) with elbows out and hands up for added width.