Fitness Ball Chair with Back RestFITNESS BALL CHAIR WITH BACKREST This patented balance ball and ergonomic chair provide healthy, proactive sitting while improving posture, reducing fatigue & building your core strength. We spend hours every day sitting on chairs, whether we're at the office or sitting at home. However, the human body wasn't designed for sitting in these chairs. Many ergonomic chairs claim to hold the body upright, but only for a short period. Shortly after, the