Add this fitness ball to your workouts to build muscle strength or use as a muscle massager.

Build muscle or massage out your muscles with this fitness ball from Sportime.

Improve your power, strength, and speed with your very own medicine ball! The 13-1/5 pound size is perfect for gym or at-home crunches, over/under drills, lunges, and other fitness drills and activities.

Build muscle or massage out your muscles with this fitness ball from Sportime.

Improve your power, strength, and speed with your very own medicine ball! The 8-4/5 pound size is perfect for gym or at-home crunches, over/under drills, lunges, and other fitness drills and activities.

Improve your power, strength, and speed with your very own medicine ball! The 11 pound size is perfect for gym or at-home crunches, over/under drills, lunges, and other fitness drills and activities.

Build muscle or massage out your muscles with this fitness ball from Sportime.

Build muscle or massage out your muscles with this fitness ball from Sportime.

Build muscle or massage out your muscles with this fitness ball from Sportime.

Build muscle or massage out your muscles with this fitness ball from Sportime.

Mix up physical education exercises with this teacher approved medicine fitness ball.

Mix up physical education exercises with this teacher approved medicine fitness ball.

Mix up physical education exercises with this teacher approved medicine fitness ball.

Mix up physical education exercises with this teacher approved medicine fitness ball.

Mix up physical education exercises with this teacher approved medicine fitness ball.