Body Solid Tools BSTMB16 Medicine Ball 16lbBody Solid Tools Medicine Balls. The ball's in your court for upper body, lower body and core exercises! Body Solid Tools Medicine Balls add resistance to a variety of exercises and can be used to activate and strengthen core muscles that can be difficult to target during traditional training routines. Body Solid adds a textured grip and adjustable air pressure to bring modern functionality and flexibility to time tested medicine ball exercises. Body