1. SMASH TENNIS WRISTBAND  Smash is a smart tennis wearable that gives you advice on how to improve your game. Smash uses a triaxial accelerometer, gyroscope, and magnetometer which take hundreds of measurements every second to create an incredibly detailed picture of your game. The device uses this large amount of data to deliver personalized practice paths and tips based on your ability, thereby making your game more rewarding. The wristband is small and unobtrusive, weighs only 15 grams, and has a battery time of six to eight hours. 2. ELLIPSE Ellipse is a smart bike...