Balance Cushion with Air Pump in Various ColoursThe Balance Cushion in Different Colours a Simple Way to Strengthen Your Back Muscles in Everyday Life If you spend a large part of your day sitting down, you will certainly know that it is difficult to maintain a straight posture for long periods of time. It's easy for your shoulders to slump forwards, for example when working at a PC. A ball cushion can help you to sit healthily (and straight) and train your deeper back muscles pleasantly. Because,