The ANDY RODDICK PRO PERFORMANCE SPORTS TENNIS HIT A WAY TETHER SYSTEM is a trainer designed for adult tennis players. This system allows players to improve their tennis skills by providing a convenient and effective way to practice hitting and serving. The 2-way tether system ensures that the player's hits are accurately reflected back to them, allowing for instant feedback and adjustments. Seen on TV, this product offers a fun and engaging way for tennis players to enhance their performance and take their game to the next level.