* Balance disc promotes core stability, strengthens muscle tone, improves balance and body posture. * Used as a wiggle seat to provide sensory input, and to help calm children that have a hard time sitting still. * Ergonomic seating, relieves back pain and shoulder aches * Balance cushion provides an unstable surface to exercise on, requiring you to use more muscles to stay balanced. * Ships inflated, includes a hand pump for adjustments. Stability disc size: 13 inches / 33 cm diameter Balance Disc Uses The Bintiva balance disc is an important strengthening tool that can be used by adults and children. The simple act of sitting on the disc activates core abdominal and trunk muscles.