Here’s the rule we were talking about: Stillness engenders movement and movement creates stillness. Stillness itself is considered yin and movement is yang. But as the yin/yang symbol (known as the Taiji Tu) shows, when stillness reaches an extreme it starts to turn over to movement (like the moon waning after fullness).
This is not just a theory, it is an observational point about life. If you stand still long enough you will have to move, and more, if you stick it out you will even feel a surprising amount of movement inside. If you move a lot, jogging for instance, you can ONLY do this if the internal organs are at least somewhat “held” in place by muscular pressure—that is, held still. Certainly the subtleties of your constantly adjusting internal environment are now reduced to monitoring only the essential changes but, of course, there are plenty more changes going than you are aware of.
This is crucial to understanding real Qigong. If you want more activity on the inside, you quell the outside and vice versa. It’s important to see yin /yang theory as a practical tool instead of a cute perennial philosophy or a romantic metaphor. Scholars have referenced, experimented and cross checked this information for centuries. It is a hands-on approach from a culture that sent out its governmental officials without law books but highly trained in the discrimination of these complementary forces. Yin and yang are everywhere around us. We would be dull-witted to ignore their changes since they make up so much of human life.