Nourish yang, regulate menstruation, straighten up and be happy. These four sentences, the spine is in the back, menstruation is in the front, happiness is in the top, and menstruation is in the bottom; Menstruation itself is connected with the breast, and it is also ups and downs. In this way, the interdependence of up and down, front and back, and finally the integration from Yang is almost a complete system.
The four secrets of health preservation are both theory and method. A good life begins with these four words: comprehension and practice.