Increase strength, balance and flexibility with the Ignite by SPRI Stable Ball Kit. Stay-Put technology ensures the ball won't roll away and helps secure it during dynamic exercises, while the additional weight adds resistance that boosts results. The durable, anti-burst construction will withstand any workout you dish out and can hold up to 300 pounds. Work your core, challenge your balance, and shape muscles in your whole body with the help of a stability ball. This kit includes a stability ball, an air pump, and a digital exercise guide to show you how to make the most out of your workout. Available in 55, 65, and 75cm sizes. Gender: unisex. Age Group: adult.