The Gold's Gym 20 lb Synthetic Leather Medicine Ball is designed to help you gain explosive lower body power and strength and improve your cardio endurance with plyometric training. Features of the Gold's Gym Medicine Ball include a durable, quilted synthetic leather outer and double stitched seams for resilience. You can also strengthen your upper body and core with the 20 lb Medicine Ball by using dynamic, functional movements. Add the Gold's Gym Medicine Ball to your training mix for a new, demanding workout every day. A step-by-step circuit training guide is included and instructional videos are available at www.iFit.com/videos for use with this Gold's Gym 20 lb Synthetic Leather Medicine Ball.