The Xerball medicine ball is a unique and versatile total-body training tool, helping you develop muscular strength, endurance, power, stability, and joint integrity. Designed with comfort in mind and with a firm-grip design, this medicine ball is perfect for the traditional handheld, throwing, bouncing, and light rebounding training practices. Extremely durable material, so the ball will retain its shape, even after bouncing. Add air to increase bounce and variety to your exercise routine. Comes in color-coded weights.