Stand under basket as far as you can and still shoot a bank shot. Do 50 to 100 reps.
This is one of the most under rated drills because its so simple. It promotes proper form while strengthing the arm. The number of reps also promotes instintive ablity to square up properly and shoot with good form.
Also the speed at which you can rebound and go back up allows you to do this drill in a short amount of time. You can also do several sets of 50-100 reps as you advance and still finish ibn a short period of time.The key to this drill is to stand as far under the basket as you can and still bank the shot.

The basketball drills are licensed under a Creative Commons License.
TLC: Pål Degerstrøm 2000-2008