Merrithew Stability Ball, 55cm with Pump (Black)

Sit on your Stability Ball™ to work the deep stabilizers, protecting the spine and preventing back pain. Incorporate into your workouts to build core strength, improve posture and advance muscle tone. After exercise, reduce muscle soreness and develop flexibility by using the ball to stretch and lengthen your muscles. How do I choose the correct size ball? A Stability Ball, when sized properly, makes for an active chair when sitting at a desk, keeping your core engaged, preventing and rehabilitating back injuries while improving posture. The general guidelines in choosing the correct ball size are: User height to ball sizing chart Height Recommended ball size 4 ft 11 in–5 ft 3 in   (150–160 cm) 55 cm Ball 5 ft 4 in–5 ft 11 in   (161–180 cm) 65 cm Ball 6 ft–6 ft 7 in   (181–200 cm) 75 cm Ball   Anti-burst up to 550 lbs (250 kg) Includes hand pump and bonus downloadable exercise guide