These devices are a great choice for athletes who want to bulk up from the comfort of home. I personally started to use these simulators 2 years ago. Then girls, even I did not want to watch were drysch))). Decided to change my life and to do sports. Friends advised these simulators (they used them), under the pretext that they help gain muscle mass. And indeed it is!!! It's been 2 years since then, I've been working out), and now I, the former grisu, they do not pass))). So I advise everyone. If you want to put on muscle, gain mass, or just to bring your body in order, that is exactly what you need!!!