Strenuous exercise in pregnancy may cause miscarriage, premature birth, premature rupture of membranes, and even placental abruption may occur. A certain amount of activity is needed after pregnancy, but strenuous exercise is not recommended, such as running, dancing, playing ball, etc. Strenuous exercise may cause large shocks to the uterus, causing uterine contractions and leading to miscarriage or premature delivery. Strenuous vibration may also rupture the fetal membranes and even separate the placenta from the uterine wall, rupture the blood vessels, and cause placental abruption, resulting in a bad pregnancy outcome. After pregnancy, you should have proper exercise, but also avoid strenuous exercise, you can choose a moderate amount of brisk walking or walking, etc.