Healthy, strong back… support for the back - support to find new strength - for a better quality of life. small tools that take the stress off your back - effective and easy. The Dynair Ball cushion is approved by AGR. The legendary Dynair ball cushion – developed by TOGU: Space saving alternative to large exercise balls" For back training, gymnastics and rehabilitation " For dynamic sitting that is suitable for the back" Over 1 million sold" Both sides with a velvety smooth surface" Keeps the vertebrae gently in motion Trains spinal musculature Can help maintain an upright position