Working out during the 1-3 days of menstruation is not recommended because the endometrium is just beginning to shed and the menstrual flow will become heavy at this time. If strenuous exercise accelerates the shedding of the endometrium, it will cause heavy menstrual flow and will be accompanied by blood clots. You can start exercising moderately from the 4th day onwards, such as walking or brisk walking, but strenuous exercises such as jumping rope, running or even cycling are not recommended, as they may cause heavy menstrual flow. During menstruation, you should pay attention to balanced nutrition, eat less spicy, stimulating and cold food, pay attention to the hygiene of your vulva, wash your vulva every day, change your underwear every day, and change your sanitary napkin every 4 hours to avoid the contamination of menstrual blood that can cause inflammation of the vulva and vaginal inflammation, which can have unnecessary effects on your body.