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stules
07-07-2009, 08:50 PM
Hi
After going through the trophy position momentarily, and perhaps hesitating slightly. Is the next part, the initiation of the serve done by hip rotation , or by leg drive? The arm is 'live' as in loose, and just follows along. but what is the first spark?
Stuart

SystemicAnomaly
07-07-2009, 11:06 PM
As the racquet head drops from the trophy position, the hips are turning and the legs are extending (driving upward). Both actions are happening simultaneously, for the most part. In looking closely at the Sampras serve, it would appear that the hips might be leading the leg drive by a scosh.

Datacipher
07-08-2009, 12:07 AM
While standard ignorant tennis analysts will say it starts with the legs, this is not true. The biomechanics of a rising spiral dictate that actually, it's the core of the body(including the hips), that initiate the movement. HOWEVER, the legs must obviously also be activated to do this!

So, the actual answer should probably be, (and the most practical answer), the legs and hips fire together. Don't listen to anybody that tell you something different.

LeeD
07-08-2009, 09:37 AM
To hit a tennis ball, you need the whole body chain, not one isolated part.
You can initiate originally from different parts, but when it starts to move, all the parts are involved.