First generation machine. Bought about 8 years ago. Used it quite a bit back then. It seemed to help. Now it just takes up space. Used to retail for $180. New generation is retailing for $150. What it does is you put your legs up on the top and it gently moves in a rotating position so that it makes your lower spine move in circles. Kinda like the chiropractor does in the office but no cracking. Price firm