Since our body is an organic whole, it is also a unified entity within nature, therefore changes in the environment may affect it. For over two thousand years Chinese Herbalists knew the value of taking multiple herbs or formulas as primary therapy compared to the West where herbal cures were based on individual herbs and rarely included any cures involving combinations of herbs. Scientific studies show that formulas are more effective in the treatment of illness. When you exercise often, you use up plenty of yang energy, and you deplete your ch'i. To keep your yin and yang in balance and increase your ch'i one must use herbs classified as Tonics.
Tonics nourish, tonify and replenish the deficiency of ch'i and yang weakness.
Yang tonics fortify the body's resistance and are believed to do the following, adjustment of adrenal function, nourish and strengthen, adjustment of energy metabolism, promotion of sugar metabolism and synthesis, promotion of growth, and increase resistance to diseases. Ch'i tonics help the functions of the organs and increase physical strength and of course to, correct ch'i weakness. Now here is the kicker and the reason I mentioned that you walk not run to your local herb shop. As you deplete your yang and ch'i, you are also slowly burning up your yin. This creates an imbalance which could lead to a weakness in your physical condition, or possible illness.