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Old 12-13-2012, 10:06 PM   #16
Virtua Tennis
Join Date: Jul 2008
Posts: 576

Are you using more chest muscles to serve or are you using more shoulder to serve. If you want to protect your shoulder you need to learn to use more chest muscles like Sampras or Roddick who lean back and use more chest and less like Sharapova who drops the shoulder down.

Try watching this
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