All you have to do is to control your diet, be full at eight points every meal, never eat snacks, and go jogging if you have nothing to do. It takes more than 30 minutes. Finally, do sit-ups before going to bed every day. If you can't get up, add 5 one day after 10, 10, and then add it again and again, and the last day is 50. You can stick to it. This effect comes out slowly, at least for a few months. I really don't know if I want a quick method. Anyway, that's how the six-pack man I know insists.