It is unrealistic to lose weight quickly. There is also a very important standard. You should exercise for an hour, but with quality. Without quality, it is difficult to really achieve the goal of losing weight (for example, you can slow down when you start exercising, and you can start to speed up a little when you get used to it, just like it takes 50 minutes to run five kilometers a month at the beginning and 40 minutes after half a year).