The Oncourt Offcourt Serve Doctor helps beginners develop a proper serve stroke Getting a feel for c * orrect body position relative to ball position on the serve or even groundstrokes is a problem for * any beginning players The Serve Doctor is a simple yet professionallooking device consisting of an * xtension pole and Velcro system that attaches to any tennis ball Just hold the ball in position and * have the player hit it right off the rope The Oncourt Offcourt Serve Doctor is just that simpleNote