Weve come a long, long way since the days when smart wristwear did little more than track your footsteps. Need proof? Smash has unveiled a wearable dedicated to tennis. The wristband uses motion sensors to track many aspects of your swing, ranging from spin to your favorite shot types. Once youre done attacking the ball, you can check your performance through a connected Android or iOS device — itll be clear if your volleys need more power, or your backhand is inconsistent.
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