This 55 cm. Stability Ball is ideal to strengthen core muscles such as your abdominals and obliques. Built with a non-slip surface and heavy-duty materials, the 65cm. Stability Ball can handle rigorous workouts. Easily inflate the ball with the included dual-action pump. Great for building core body muscles 55 cm is perfect for users who are 5'8"- 6'3" Constructed with a non-slip surface and heavy-duty materials Dual-action pump included
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