HEAD Wrist Ball Trainer - Auto-Start Arm Strengthener | Gyroscopic Wrist and Forearm Exerciser with LED | Muscle and Bones Workout INCREDIBLE TO USE : simply hold the ball in one hand and rotate your wrist to get it spinning. You can then increase the resistance by rotating your wrist faster or slower, depending on your fitness level and goals.the resistance is controlled by rotating the wrist, so that the fingers to shoulder muscles can obtain low-impact movement IMPROVE PERFORMANCE: improve athletic performance, recover from an injury, or simply add some variety to your workout routine, the Wrist Ball is the perfect solution. STRENGTHENS MUSCLES AND HELP RECOVERS FROM INJURY: Strengthens tendons, ligaments, Improve muscle strength for fingers to shoulders Muscle Strengthening and Recovery Exercises PROFESSIONALY MANUFACTURED: Ball bearing is stable and has a solid rubbery bottom to ensure the ball stays in place and will give you an accurate, ergonomic range of motion while running. HIGH QUALITY MATERIAL: The wrist rest is not easy to deform and damage.exquisite craftsmanship: Exquisite craftsmanship and light weight design, the sports ball will not be easy to break down. HEAD: Get in the game, and stay in the game, with training gear from HEAD Fitness. Rock your core, burn off calories, sweat off the pounds, and soothe achy muscles. HEAD Fitness carries a full line of gear and accessories that will help you reach your potential from the court to the gym, and from the slopes to the yoga studio.