Snag the 23″ Inch Balance Ball Trainer Yoga Fitness Strength Exercise Yoga with Pump for only $39.99 shipped on eBay right now. It is a tool which is used to cooperate in sports fitness ball games. It is made of soft PVC and ABS materials, when the body contact with it, the internal inflatable fitness club evenly touches parts of the body to produce the massage effect, and will promote the blood circulation. It not only can help us effectively strengthen physical health, but also the effect of weight loss. Try it and make you more beautiful!