A medicine ball is a weighted ball-shaped training device that simultaneously strengthens muscles and the core. It adds "weight" to muscle training to increase the load, and increases the load on "throwing" and "swinging" movements, which can also be expected to strengthen the core. It is compact enough to be held in one hand. Effective not only for sports but also for dieting. Since it can increase muscle strength and strengthen the torso, it is expected to improve the performance required for sports. Various uses are possible. Three weights are available, so you can choose the best weight for your own exercise, from maintaining muscle strength for rehabilitation to increasing muscle strength, or for parents and children. The soft, resilient PVC material makes it easy to use at home and prevents damage to walls and floors. The soft type is safe even if it is dropped, and it is less likely to make noise.