Here's some reading on use of the hips:
https://www.discussfastpitch.com/so...-points-resistance-pitching-3.html#post207402
https://www.discussfastpitch.com/softball-pitching/16719-creating-correct-core-torque.html
https://www.discussfastpitch.com/so...-points-resistance-pitching-3.html#post207402
https://www.discussfastpitch.com/softball-pitching/16719-creating-correct-core-torque.html
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