The vast majority of tennis players simply don’t get the as much out of their groundstrokes as they put into them. Why? They don’t use their body effectively or efficiently. Today’s video tennis lesson is going to show you my favorite drill to get the feeling for finally using your whole body while keeping your arm and hand relaxed. Give it a try, I bet you’ll like the results!
http://www.essentialtennis.com/ultimate-groundstroke-power-drill/?WickedSource=Facebook&WickedID=ultimate-groundstroke-power-drill
(二) Eye Contact ：
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