Ships from Hong Kong. This easy-to-use fitness ball is ideal for physical therapy and weight training at home. You can also use it for core conditioning, spinal stabilization and balance training. With applications in yoga as well as fusion exercises, this ball suits various workout styles. Moreover, you can use this ball to help strengthen your back, abs and buttocks. The durable shell of this ball doesn??t burst on the spot but releases air slowly when it gets punctured. Diameter: 55cm Exercises abs, back, gluts, hips, arms, and other muscles Features a durable, burst-resistant shell Can be used in yoga, pilates, and fusion exercise programs Features soft rubber surface for increased comfort