Chi circulates in the body through several channels or meridians. Along these meridians are points that can be used to influence chi flow and alter the balance. Chi energy can be thought of as similar to electromagnetic energy. Just as electricity has positive and negative energies, chi consists of opposite energies called yin and yang. There are many ways to influence yin-yang balance.
Acupuncture is one such technique.
Traditional Chinese herbs are another. Tai chi is an exercise that strives to accumulate chi, store it, and circulate it through the body in balance. According to Chinese tradition, this can maintain health, prolong life, heal others, or be utilized in combat. It is not a coincidence that most of the tai chi players in Chinese parks are senior citizens. Because tai chi uses chi energy rather than strength, increasing age is not a limitation.