Gaiam's Stay-N-Play Ball XL features a 52cm inflatable yoga ball with built-in no-roll stabilizing legs offering a fun way for kids to keep the body active and the mind engaged in learning activities. Active sitting helps promote a healthy posture and increase blood flow to the brain leading to better focus, making it ideal for any classroom. This balance ball technology makes for a great alternative to the traditional desk chair for kids with high energy, ADHD, ADD, or other learning disabilities. Ideal for ages 8-11. Includes easy inflation pump.