When i saw this on TV I just had to have it. I have a very bad back and keeping the stomach muscle built up is a must, so The Bender Ball looked like the perfect thing for both my back and stomach. I now wished I had never saw it, The bender Ball nearly broke my back there is no real support for it and I was not able to do anything with it that I could not have done with any other ball the some size, without the price!!!