Add resistance to a variety of exercises, or use in rehabilitation. Medicine ball fits in the palm of the hand allowing you to move freely through a full range of motion during exercise. Perform a wide range of upper- and lower-body exercises including crunches, rotational twists, and leg raises. Durable outer shell made of pliable PVC contains filler. Balls do not bounce and are not intended for throwing. Color coded by weight; colors may vary. 5-1/2" diam. (1 lb. to 5 lb. balls); 6-1/2" diam. (6 lb. to 10 lb. balls).