2021 Hot Sale Auto Start Wrist Trainer Wrist Muscle Gyro Arm Exerciser Strengthener Fitness Ball Wrist Ball
1. Principle of wrist ball: applying gyroscope and similar principles of celestial mechanics, strong inertial centrifugal force is generated during movement, so that the arm and wrist can feel the best state of movement.
2. It can effectively alleviate musculoskeletal pain caused by long-term use of the wrist and arm, and it can also help fitness enthusiasts to carry out targeted strength training.