I went to see it. It seems that it was trained by ems. People always crowd out new things they don't understand. Most people are the same. I suggest you buy one and try it yourself. Anyway, I think they can return it in 30 days. Maybe you are confident in your product. If it is really to make the muscles move instead of passively shaking (it is useless to test the shaking machine, which makes people drag rather than run), since the muscles are moving, whether it is voluntary or not, it should be no different from real exercise.

Ps: Look for relevant literature in Zhihu, /question/5936747 1, for your reference.