to balance and health by understanding the laws of these natural forces. Man as is a microcosm that mirrors the larger macrocosm. The principles of yin and yang, the five elements, the environmental factors of wind, damp, hot and cold and so on that are part of the macrocosm equally apply to the microcosm that is man.
Reference : http://en.wikipedia.org/wiki/Huangdi_Neijing (From Wikipedia.org)