Tennis is a great sport to help you burn calories and get fit. You need to practice your shots to become better at it though. The Zepp Tennis Swing Analyzer can help you in that regard. It helps you track shot type, power, spin, and total court time. You just have to connect this motion-sensor to your tennis racket to start analyzing your data on your iOS device.
You can use the Swing Analyzer to measure how many topspin, slice and flat shots you hit by shot type. Users can track and share their data with others. Sets you back $149.95 at this time.