Ancient Chinese people were greatly interested in the relationships and patterns that occurred in nature. Instead of studying situations and things in isolation, they viewed the world as a harmonious and holistic entity. In their eyes, no single being or form could exist unless it was seen in relation to its surrounding environment. By simplifying these relationships, they tried to explain complicated phenomena in the universe.
Yang is the energy that is responsible for warming and activating bodily functions. When Yang is in decline or deficient you feel cold and your body begins to slow down, displaying signs of under activity. There are a number of simple methods to tonify Yang