My personal suggestion is actually a combination of exercise and diet. Exercise more at ordinary times, pay more attention to diet, and don't eat greasy food, especially snacks. Exercise I mean to exercise more, but not too much. It's not good for your health. For example, you can go to work by bike near work, don't stay indoors in your spare time, go out more, climb more mountains and swim more, all of which are good for losing weight!