1Tennis Trainer: Due to the presence of a valve on the base for storing sand or water to increase weight, there is also a valve on the base, a small ring on the side for hanging straps, and a concave part for placing tennis balls, which can provide stable support for training and is convenient and practical. 2User Friendly Design: The design of the tennis trainer anti slip hole can be filled with heavy objects for training. The semi circular groove structure makes the ball easy to attach. The wall mounted traction rope groove design helps with cleaning. 3Easy to Use and Carry: Tennis trainer rebound ball is easy to use and easy to train, without the need for picking up the ball, and is lightweight and easy to carry, making it perfect for single person practice. 4Tennis Trainer Rebound Ball with String: Tennis trainer can be used with rope tennis balls, using elastic ropes to tie the ball to the base for precise control and practice tennis skills. 5Improve Your Motor Ability: Tennis trainer rebound ball can improve your attention, motor ability, and hand eye coordination, and develop an interest in sports. 6Wide Applications: Tennis trainer is not limited by the venue and has a moderate amount of exercise, making it suitable for tennis courts, basketball courts, gardens, parks, garages, basements, fitness rooms, or other open spaces.