Used to improve balance, coordination, flexibility, and strength. Features a nonslip surface with ribs for extra security. Can be underinflated to give a soft, mushy feel or fully inflated for a firm, bouncy feel. Available in various color-coded sizes and 3 styles: Standard ball has a 300-lb capacity, ABS Extra Thick ball has a 450-lb–600-lb capacity range, and Super-Duty Super Thick ball has a 600-lb capacity.