I saw this on HSN and thought it would be a great way to work on my core, build muscle, and lose some inches around my waistline. OMG! I didn't realize how out of shape I am. I is really a challenge, but I know if I stick with it, I will see results. You can really feel it working. I was sore only after a few reps, which means it is doing what it is supposed to. It is a large piece of equipment, so it takes up a lot of space. Too bad it isn't collapsible so I could put it away, but then I might not use it as often, so that's okay. I will be glad when I can work out at the level that Tony and the models do. Great product, well worth the investment.