The body balance ball does work your body out. It is easy to set up and use. The exercises that you do can be quite challenging at times, but the nice thing is that you can do the exercises that you want to your own intensity level. The ball comes with the pump and after a lot of pumps the ball is filled with air. It seals well so you don't have to fill it with more air as much. I also like the bonus things that come with it. This ball can be used for so many different exercises. I like that you can even just sit on it while watching television and it will be working your core. I have also heard of people bringing these to work to sit at a desk with instead of an office chair. I still have one of these balls sitting in my garage. I don't use it as much as I did when I first bought it, but it is still a good product that holds a good amount of weight. It is a unique and fun way to exercise and even my kids like to use this. It's a good way to stay in shape or to get in shape!