Start adding weight to your yoga, pilates, or aerobics with the Prism Fitness 8 Pound Weighted Fitness Smart Medicine Ball. This compact medicine ball has a dense core that adds plenty of weight that engages a variety of muscle groups as you sit-up, twist, plank, squat, and perform other standard exercises. If you're wondering where to start, the home gym medicine ball has 8 exercises suggestion printed on its surface to provide direction. A rubber shell encases the core, providing extended durability, and is textured to provide a confident grip. On its own or used with other medicine balls, kettlebells, or free-weights, the 8-pound core toning and fitness ball is a great way to start toning up, working on physical therapy, or stretching those sore muscles.