How to Do the Drill:
Stand directly beneath the basket. Step across your body with your left foot, laying the ball in with your right hand. DO NOT DRIBBLE THE BALL. After making the lay-up, step across your body with your right foot, and lay the ball in with your left hand. Do this in sets of thirty. If done correctly, you should be in a rhythm where you do not need to take more than one step in each direction to lay the ball in.
As you get better, you will be able to do this at a very high speed without missing a shot. It is vital to be able to score with both hands near the basket, and this is one of the best drills for working on this skill.