Used to improve balance, coordination, flexibility, strength and even just for fun. Balls are used by pediatric and NDT therapists as an aid for vestibular movement and equilibrium therapy, by fitness professionals as an aid for stretching and strength programs, as seats, and much more. Under inflate for soft mushy feel, or inflate until a firm, bouncy feel is achieved. ONE OF THE BEST SHIPPING RATES ON THE WEB. COMPARE AND SAVE!!