Do sit-ups, pay attention to: tighten your hips, put your hands on your ears, sit up like a roll of paper, and rise to about 15 degrees each time. Action standards can play an obvious slimming effect, 50 before going to bed and 50 after waking up every day. If you have time, you'd better take part in some high-intensity sports, such as badminton, swimming and basketball, two or three times a week, which is too much and too tiring.