Personally, I think it's ok. It was an old technician who gave me a massage, and the intensity was quite heavy. My friend was still laughing at me and cried out in pain. My pain just twisted my body. The technician thought what was wrong and asked me if I needed to reduce my strength, but I felt pain and happy and didn't ask for relief. Later, I had a backache for about 3 days, and they said it was normal. Anyway, on the whole, it's still good