Swopper Air Motion Chair With Wheels - Stone Grey 1. Always sitting properly. By keeping balance on the sprung seat your body is always slightly in motion. 2. Good for the intervertebral discs. Sitting upright and the constant changing of posture mean that your intervertebral discs are loaded in parallel at alternating pressure points. 3. Training for the muscles. Since your entire body is slightly in motion all the time on the swopper chair, practically all muscle groups remain active and well supplied with blood. 5. Keeping ligaments and joints fit. Moving your joints stimulates the formation of synovia (joint fluid). This helps to lubricate the joints.