As far as TCM health preservation is concerned, the ups and downs of human body are determined by the ups and downs of viscera. If the zang-fu organs are normal and the human meridians are normal, you will not get sick.
The exuberance of zang-fu organs depends on many aspects of conditioning, including diet, daily life, exercise, mental adjustment, etc., not just regulating one's own meridians, but of course the regulation of meridians is a very important part.
I suggest buying it in two ways, one is Chinese medicine and the other is health care products.
I read Xiao Yansheng, Manual for the Use of Human Meridians 1+2,-Preparation for Health Preservation and Longevity of Chinese Medicine-Family Health Research Group of Yangshengtang, Symptomatic Treatment-Manual for Hand and Foot Massage-Yangshengtang, and the last one is a little dietotherapy.