Stability Cushion with Air Pump in Various ColoursThe Wobble Cushion for Better Posture and Stimulation of the Deep Muscles Many people who spend most of their day sitting in the office are familiar with the problem: as the day progresses, it seems increasingly difficult to sit up straight. Instead, the shoulders slump forwards, and the back becomes rounded. The result: back pain, which can become chronic. Weak muscles are often the reason why the body is unable to free itself from this "posture