Looks like Juan Martin Del Potro is gearing up for a big 2014 season. Some good training exercises highlighted here. Can he plant his feet firmly into the top 4 this year?
http://www.youtube.com/watch?v=2G-76QbaAy8
Kyle LaCroix USPTA
Boca Raton
http://www.youtube.com/watch?v=2G-76QbaAy8
Kyle LaCroix USPTA
Boca Raton
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