The Mao Period is the time between 5:00 a.m. to 7:00 a.m, so, it is normal for people to wake up at 5:00 a.m. During this period, the large intestine is on duty, and the sky is getting brighter, and the body flow is opening its "door" that usually we will move our bowels in order to excrete waste and toxins from our bodies. This period represents the opening of body Earth's Door, in other words, the opening of the anus, and that is why we should develop the habit of moving our bowels in the morning. If there is a difficulty in defecating, one should try to hold a breath instead of grasping fists.

Traditional Chinese Medicine philosophy believes that the lungs system and the large intestines are working as a commander to soldiers, when lungs system is energetically stronger, then one's defecation will be smooth.