TennisFlex Pro Used by Janko Tipsarevic with an Iphone 4s case autographed.

World No.8 Janko Tipsarevic Trains with TennisFlex -first racquet integrated tennis-specific resistance training device for Ultimate Tennis Performance. Whether you want to hit with more power, develop more spin or prevent injuries, TennisFlex is the instrument for you. TennisFlex, is the first integrated tennis performance training device, that allows for precise and tennis-specific muscle micro-conditioning that can be used both on and off the court. Prevent Injury & Recover Faster Avid tennis players often suffer from tennis elbow due to overuse. With TennisFlex you can ditch annoying elbow bands and feel relief. TennisFlex solves the problems in the relationship between stroke mechanics and past injuries due to improper muscle training. The only clinically proven way to properly rehabilitate the tennis elbow is to condition the muscle and tendon by increasing blood circulation to the pain zone. The patent pending TennisFlex is the only training aid designed exclusively to cure and prevent tennis-related injuries.