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Old 01-11-2008, 06:44 PM   #65
JCo872
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Join Date: Aug 2004
Posts: 1,390
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The number one source of power on a serve is pronation - the turning outward of the hand and arm on impact. You can have pretty lousy fundamentals, but if you get this right you can still crack a serve. This is why pros can warm-up at about 40% and still hit extremely hard serves. This is why you can hit an overhead that hits the ground and then jumps over the opposite fence. The torquing motion is like a mini atom-bomb in terms of power generation.

In Sharpy's serve, he isn't getting any pronation at all:
http://www.hi-techtennis.com/serve/sharpy_serve.php
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