1, if it is to reduce the upper abdomen, there is no need to do supine. You can lie down like this, with your calves perpendicular to the ground at 90 degrees, your hands straight and your hands reaching to your knees, which is similar to lying on your back, but it is more effective, at least150 a day;

2. If it is the lower abdomen, you can lie flat. This time, raise your legs 90 degrees, then bend slightly, put your hands on the ground and use your waist and abdomen. Don't lift your hips, at least 150 times, or you can reduce your abdomen;

3. You can do it in groups, but you must stick to it for more than 3 months to get obvious results.