Burst Resistant Stability Ball Simple Movements Become Strategic as Your Body Activates Nearly Every Muscle to Maintain Balance 4 Target Core Muscles 9 Get Lean from the Inside Out Not only will you get flab-free abs, shrink your waistline re-shape your hips with just the ball, you ll have fun doing it! Incorporate this ball into your pilates, yoga, stability training or fitness exercises to focus on major muscles groups for maximum results. You will also enjoy using it to improve your body s core strength natural balance while getting trim toned. This ball is especially perfect for strengthening your core stretches maintaining flexibility can even be used as a desk chair or taken to the gym. Made from a high density polymer that resists tearing puncturing it is designed to support up to 600 pounds of pressure.