Suggestion: It is suggested that it is best not to do any physical exercise during menstruation and not to make yourself particularly tired. You can take a proper walk and do the housework you can. Pay more attention to rest during menstruation, and it is best to ensure that you sleep for more than 8 hours. When you get up early, you can go outside to breathe fresh air properly. It is best to have a light diet, not too greasy. If you want to exercise on the fourth day of menstruation, you need to judge according to the way of fitness. Do not do strenuous exercise, such as running or lifting weights, fighting, colorful bicycles, etc. These exercises can't be done. These exercises belong to strenuous exercise, which may cause menstrual blood reflux, endometriosis and dysmenorrhea, and may lead to infertility. So on the fourth day of menstruation, strenuous exercise can't be done. However, soothing yoga can be done properly, and it is also suggested that you can take a proper walk without affecting menstruation itself. Although menstruation is a normal physiological period for women, it is recommended to rest properly and not to exercise vigorously.