The answer is: yes! Sure！ Sure！ I jump rope thin! But keep a certain amount, every day. It started after the winter vacation. I was very tired at the beginning of jumping 1000, and then gradually increased to 1500. The last jump of 5000 won't feel anything! Jump for more than half an hour, do not eat or eat less. In early summer, I lost 25 Jin ~ I was in excellent health and no longer caught a cold:)