One thing you can do at home is to swing your ball. Start with a normal set up with the majority of the ball weight in your non-bowling hand. Push it out and let it fall using gravity. You'll note that your back swing isn't all that high with no muscling. Pay attention to your hand position. If you're right handed, see if you tend to turn your hand counter-clockwise. Practice keeping your hand behind the ball and your thumb pointing to the right. When you get back to the lanes, hopefully you'll keep your hand behind the ball there, too.
Good luck...
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