In fact, crossing the valley is a long-standing method of health preservation and self-cultivation From a medical point of view, after a period of time, the valley can also detoxify and remove the garbage in the body. You can try it, which is a scientific way of keeping in good health. However, it needs to adapt to the process. I suggest reading some books, looking up some information and recommending a health expert, Sheng Wenzi. There are many health books, you can go and see them or find some videos online.