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Keep in mind that most release problems, early turn for example, are generally a result of something in your approach which in turn causes the release problem to happen. Most of the time early turn is a result of improper timing and/or too much muscle in the swing which will make achieving a more powerful release more difficult.
Try to keep your palm facing the target area right up to the release point. Then the fingers, not the arm, can create rotation. Hitting up on the ball by imparting too much lift will actually decrease the effective power of the release.
A no-step approach is a good exercise to practice the release motion. Set up at the foul line in your finishing position. Create a smooth rounded pushaway and let the ball swing freely while keeping your palm forward. Fingers should move through and slightly counter-clockwise to add rotation motion as the thumb exits the ball. This drill also allows you to watch your hand motion to help improve the release more quickly. Remember it is very important that you have a free arm swing and maintain good balance throughout this exercise. Without these two pieces, it is more difficult to work on the hand motion of the release.
Foul Line Balance
You should be able to maintain your balance at the foul line until the ball hits the pins. Remember that good foul line balance is really just the result of the proper timing and free arm swing throughout your approach.