Self Training Tennis Helper

When the base is filled with water, it instantly becomes heavy enough to hold the unit. Non-skid pads underneath help keep it stable.Unwrap the cord, hit the ball as hard as you want, and the ball bounces back to you. -The harder you hit, the faster the ball will rebound to you. The rubber cord is 15 feet long and stretches to 30 feet for hard-hit balls.Wrap some of the cord around the base to your desired length to shorten the rebound. It is an excellent device for practicing your strokes, developing a faster swing speed, or warming up.Great for driveways, garages, and basements, or bring it to the court with you!Have fun exercising this summer with this new tennis helper!