Promotes core stability and provides many of the same benefits of a gym ball while performing lower back and abdominal exercises. Can also be used in some chairs. Support and challenge the spinal muscles while enhancing posture. For children with hyperactive nervous systems the tactile surface has been shown to enhance calmness and concentration. Can be used on the floor for exercises just like a stability ball to improve balance and increase strength. The larger surface works well for exercises using two feet shoulder width apart. Perfect for developing core stabilization and balance. Perform exercises while sitting, kneeling, or lying on top of the disc for dynamic stabilization training. Inflation requires a standard foot or hand air pump. Supports up to 450lbs.