I insist on 30 minutes every day, even if my legs are numb, I have to insist on 30 minutes before I put it down. It only lasted for more than ten days and was effective. The calf visible to the naked eye has lost weight. I think it is only useful for the calf, and numbness is also numbness of the calf. I will do 100 hip bridge first, then lean on my legs and touch my knees on my back for 20 minutes. I don't know if it will help.