A, women should not choose to jump rope during menstruation, jump rope can produce strong abdominal pressure, so that menstrual flow increases, uterine prolapse, dysmenorrhea. Pregnant women also should not jump rope, easy to lead to miscarriage. Second, obese people because of heavy weight, in the jump rope, the weight will produce excessive pressure on the leg joints, leading to joint injuries. Also not used for weight loss exercise. Third, jumping rope is a jumping weight-bearing exercise, if jumping rope more than two hours, may be very tired, high blood pressure, heart disease people should not do this exercise.