1, use the method of reducing abdomen and waist during menstruation to do abdominal muscle exercise on your back. Navel movement: lower body fixed, sit-ups, aimed at tightening and flattening the protruding part of the stomach.

2. Menstruation is a physiological cycle that occurs between some fertile female humans and chimpanzees and other animals. Spiny mice, cows, mares, camels, sows, ewes, etc. There will also be menstruation, and some mammals will go through the estrus cycle. In women of childbearing age and primate females, the endometrium undergoes autonomous thickening, vascular proliferation, gland growth and secretion, endometrial collapse and shedding, accompanied by periodic bleeding changes every other month. This periodic vaginal bleeding or uterine bleeding is called menstruation.

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