Do you want to be the current Maria Sharapova or Rafael Nadal? You’ll need to train harder than you ever have and know what you’re doing. The Zepp Tennis Swing Analyzer attaches to your racket and relays all the data during your game. You receive all relevant metrics on your iPhone, iPad or iPod touch. How many shots of what type, the strength and performance during the whole game are some of the key information you receive. You also can observe a 3D representation of your swing. Everything is straightforward and easy to analyze, so you can improve by leaps and bounds. $149.95