Combines elements of cardio, strength, and flexibility into unique and highly effective workouts; Forces you to maintain your center of gravity while performing any exercise 26-inch ball increases the difficulty of workouts and builds strength faster by forcing the engagement of more muscles Improves flexibility, endurance, strength, and ability by performing versatile workouts Ideal piece of equipment for rehabilitation and physical therapy with the unstable surfacing Oncludes a guided workout and easy-to-use inflation pump; Made with strong, non-slip, non-marking burst-resistant material and can support up to 350 pounds