HOW TO PICK A STABILITY BALL Most users fall in the 55 or 65 cm range, (51 57 and 58 61), however we do carry 45 cm balls for users 50 and less and 75 cm balls for users taller than 62. If you are using a stability ball for any heavy weight-bearing exercises pay attention to the static weight limit/burst resistance to ensure the ball can withstand the additional weight. WHY USE A STABILITY BALL Stability balls are also known as exercise balls, yoga balls or swiss balls, and have a variety of uses in home gyms, commercial facilities and physical therapy offices. Use the ball for gentle stretching, balancing or working on abdominal strength. Incorporate the ball into fitness routines for additional instability to work your core. STYLE AND FUNCTION The smooth, slightly dimpled surface of the black ball offers a full 360-degree range of use, no raised surfaces to impede comfort when rolling your body on it.