ENOVI ProfiBalance Exercise Ball Chair - Seat Ball with Chair Covers, Stability Ring Base, for Office and Home, Improve Balance, Core Strength and Posture, Relieve Back Pain, 75 cm, AB : Amazon.co.uk:
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Gaiam Balance Ball Chair - No Roll 65cm Premium Ergonomic Yoga Ball Chair for Home and Office Desk with Exercise Guide, Easy Installation Ball Pump, and Built-in Stability Legs : Amazon.co.uk: Sports