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Old 10-11-2012, 10:11 AM   #5
wrxinsc
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Join Date: Jul 2010
Location: Cackalacky South
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That's a great idea to increase your core strength for tennis by developing simple, repeatable, and reasonable habits. Just simply doing increasing numbers of crunches and sit ups using proper mechanics on a regular basis and making that part of your daily routing without fail will pay huge dividends. Nothing magic about it either. Just keep doing them!

Good luck with your tennis and growing up. Awesome times ahead!
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