Useful. Generally, it is quite useful to dance little red riding hood and little gray hat. The name is distinguished according to the color inside the hat on her head. It takes about 10 minutes to exercise once, and it's very tiring to do it twice. You will sweat all over. If your period comes, you can stop it in the first three or four days. The golden period of losing weight is the last two days and the next week of MC, so make good use of it.