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Old 03-20-2013, 11:47 AM   #14
Chas Tennis
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Join Date: Feb 2011
Location: Baltimore, MD
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The leg thrust and some trunk motion probably stretch the muscles that drive the serve. This muscle is probably mostly the lat. Apparently, even without the leg thrust a lot of stretch still can occur. ?

Earlier thread discussing serving from the knees.
http://tt.tennis-warehouse.com/showthread.php?t=414039&
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