Yin and yang propel, attract and mingle with each other, and in turn cause changes in nature. Sustain jing and qi to nourish the body and cultivate zhenji (the moment when the prenatal and postnatal qi combines into one) in conformity with the law of nature and your health will im-prove a lot.
Method of practice: Keeping in a sitting position, start the exercise consciously but conclude it subconsciously. In the beginning, direct and rotate qi from the inside of the body to the outside and from small circles to large ones, with the couplet being recited silently: "The white tiger hides in the east and the black dragon lies in the you position on the taiji diagram. " Rotate in a circle whilst reciting a sentence of the couplet, and you have to rotate your qi 36 times. When you collect qi, rotate it from the outside of the body to the inside and from large circles to small ones. In so doing, recite the couplet 36 times: "The black dragon lies in the you position on the taiji diagram and the white tiger hides in the east. " Re-turn qi to its source in the state of taiji. That is called one zhoutian. Af-ter persistent practice, no mental effort is needed to guide the movement of qi, and jhlun will rotate of itself.