It is best to run after 2-3 days of clean menstruation, because although the menstrual blood is completely clean from the outside, there may still be a small amount of menstrual blood left in the uterus, so do not run at this time. In addition, the hormone level in the body has not yet returned to the state of non-menstrual period, it is recommended not to run at this time, and then run and exercise 3 days after the menstruation is completely clean. It is important to keep warm and not to do strenuous exercise during the menstrual period, and to rest properly during the menstrual period, and bubble your feet with hot water every night before going to bed, which can promote blood circulation in the lower limbs, improve the fatigue during the menstrual period, and make the menstrual blood flow more smoothly, and reduce the discomfort in the lower abdomen caused by menstruation.