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Old 01-20-2013, 09:48 AM   #8
The Dampener
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Join Date: Aug 2006
Posts: 1,325

It's everything—the frame you use, racquet head speed, your strength, your technique. Heavy balls don't come from one place.

But, mostly, it comes down do how effectively you use your kinetic chain, which ultimately is a result of all of the above.
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