Body Solid Tools Medicine Ball 4 Pack with rack.Body-Solid Tools Medicine Balls are total-body training tools engineered to help develop muscular strength, power, stability, endurance and cardio endurance. Designed for exceptional comfort, Body-Solid Tools Medicine Balls feature a firm-grip design, ideal for throwing, bouncing and light rebounding. Adjustable air pressures puts users in full control of the bounce and adds variety to exercise routines.