• A high-quality ball made of thick rubber or plastic manufactured by a reputable fitness company. Cheap balls have been known to pop while people are using them, which can lead to serious injury.
• The right size ball. As a guideline, people under 5 feet 6 inches should choose a 55 cm ball; those 6 feet 2 inches and taller should choose a 75 cm ball, and those in between should choose a 65 cm ball. When you sit on the ball, your hips should be slightly higher than your knees.
Arthritis Foundation National Office1355 Peachtree St NE Suite 600 Atlanta,GA 30309 Home Office 404.872.7100 Helpline 1.844.571.4357 Customer Service 800.283.7800 Arthritis Foundation is a qualified 501(c)(3) EIN 58-1341679