Uphill Throwing

Newton’s Third Law states “for every action, there is an equal and opposite reaction.” A major throwing fault that increases the time under tension upon the UCL and shoulder occurs when a player throws uphill. Uphill throwing is described when the hands separate during the final moment of the windup phase and the glove side hand moves higher than the corresponding shoulder. This action causes the torso to lean back away from the target. As a resultant action, the throwing hand goes below the greater trochanter causing increased time under tension upon the UCL as described in the section Throwing Hand Drops Too Low Below Hip.