During forearm accelerations, shoulder joint muscles mioanglosly inwardly rotate humeruses. Until elbow and forearm joints accelerate forearms, pitchers cannot powerfully inwardly rotate shoulder joints. During decelerations, shoulder joint muscles plioanglosly flex, horizontally extend and abduct humeruses. Flexions stop humeral extensions. Horizontal extensions stop horizontal flexions.
Abductions maintain vertical humeruses.
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