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Old 07-09-2013, 09:49 AM   #28
RetroSpin
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Join Date: Sep 2011
Posts: 1,283
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The OP concerned what happens when the forward swing begins. Luckily, all the top pros do the exact same thing. Through a combination of inertia, loose wrist and perhaps some manipulation, they go from a pronated wrist with some extension to a fully supinated and extended wrist, producing the distinctive laid back, facing the ground position for the racquet. This move is a reaction to the initiation of the forward swing, which in turn is driven by body rotation, the hitting shoulder going from external to internal rotation, ie SSC, and arm adduction. Biomechanically, an awful lot is going on during a very short span of time.
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