Not All Pitching Motions are Created Equal 
presented by the Professional Pitching Institute

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In Hamel's 2008 Pitching Motion, you find excellent "Back Shoulder Management", superior location and a very injury resistant motion.

In Wood's Motion, however, notice how his Back Shoulder immediately moves away from the Back Foot.  His instantaneous Back Shoulder forward swing causes him to struggle with his location and makes him extremely injury prone.