It depends on how you release it now really. Is your hand more on the side or behind the ball at the release?
If it's behind the ball, you have more options.
Hold your hand out at your side with the palm facing away from you, with your fingers straight down.
(Right handed) Now cock your hand towards your leg so the pinky finger is pointing at your leg and your thumb is now pointing straight down.
That is the strongest position you can have at the release point. If you move your hand back to straight down, that's the weakest (any more and you're throwing backup).
The nice thing about this technique is that it's an easy adjustment to make on the fly to accommodate changing your revs.
If your hand is on the side of the ball at the release, well, you can't do much to make a negligible difference. If this is the case, you may want to consider going up the back of the ball (which will take some time/training to get down).
Edit: It's worth mentioning that when you use a strong hand position at the release point, you are doing nothing with your wrist. You are simply coming up the back of the ball.
Most people learn to hook a ball incorrectly early on by twisting their hand or wrist to make the ball spin. My younger cousin did this when he was learning and said he wouldn't get as many revs if he came up the back of the ball (threw about 200 rpm at the time). When I showed him how to position his hand at the release and stay behind it, the ball cranked like a demon down lane and he was probably around 400 rpm (big kid, 16 years old and 6' 3").
The look on his face was priceless.
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There is nothing so easy to learn as experience and nothing so hard to apply.
Edited on 2/3/2009 3:20 PM