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The balance ball, long a favorite for strengthening and toning exercises, finds its ultimate expression in this desk chair. Developed by Gaiam and chiropractic pioneer Dr. Randy Weinzoff, the chair helps strengthen core muscles and improve spinal alignment. Set includes removable, anti-burst BalanceBall® (22” diameter) in black on charcoal base, adjustable support bar, easy-glide casters, air pump and a quick-start exercise guide. Free of latex and the six most harmful phthalates; recommended for individuals 5' to 5' 11" tall; easy assembly required; 31.5”h x 20.5”w x 25”d; 13 lbs.