This term refers to the lateral rotation of the radius, a simple forearm twist at the radioulnar joint. In pitching, this action generally turns the palm toward the body and upward at release.
Some supination prior to release is required to throw different types of pitches, but supination during release leaves the arm subject to forearm flyout, which can result in a collision between the ulna and the humerus as the elbow slams closed.
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