"Six-character formula" refers to the six-character sound of "shush, heh, huhu, silk, blowing and hey" when people use the ancient people's health care experience to cooperate with exhalation. Through the coordination of breathing and sound, it is an exercise method to balance yin and yang in the body. This is a deeper achievement method. It belongs to the primary sound method in "internal strength", and it can eliminate internal injuries if it is mastered well.

Emphasize deep breathing, breathe first and then inhale. That is to say, when exhaling, exhale with the pronunciation of six different words, such as "SHHH, HH, HU, HU, HI", resulting in different pressures on the chest and abdomen, which act on the liver, heart, spleen, lung, kidney and triple energizer respectively. Through the combination of flexion and extension of thoughts and actions, qi and blood in the body are guided to circulate along the meridians, so as to achieve the effects of dredging the meridians, detoxifying and resolving the stagnation, and regulating the deficiency of yin and yang and qi and blood in the human body.