On the fifth day of menstruation, it is possible to do aerobic exercise in moderation, such as jogging, yoga, walking, etc. It is recommended to avoid strenuous exercise such as weight-bearing, fast running and other exercises that increase intra-abdominal pressure. Menstruation refers to the cyclical shedding and bleeding of the endometrium that accompanies the cyclical changes of the ovaries, and the appearance of regular menstruation is an important sign of the maturity of the reproductive function. Appropriate exercise during menstruation can increase the heart rate and promote blood circulation throughout the body, which can promote the discharge of menstrual blood from the body, promote pelvic blood circulation and improve pelvic congestion, thus reducing symptoms such as low back pain and lower abdominal discomfort. At the same time exercise can also soothe the mood, relieve stress and clear fatigue. However, women who engage in strenuous exercise on the fifth day of menstruation may experience symptoms such as increased abdominal pain and heavy vaginal bleeding, so strenuous exercise on the fifth day of menstruation is not recommended.