Sit-ups: a form of exercise. Lie on your back, put your legs together, raise your hand, contract your abdominal muscles, swing your arms forward, and quickly become a sitting position. Keep your upper body bent forward, touch your feet with your hands and bow your head. Then return to the sitting position, and so on.

Sit-ups can exercise abdominal muscles, tighten abdominal muscles and better protect organs in abdominal cavity.

Sit-ups can tighten the muscles of the lower abdomen and achieve the effect of reducing stomach.

Doing 30 sit-ups before going to bed every day has obvious effect on exercising abdominal muscles, but it can't achieve the effect of losing weight.

First, the strength is not enough, and the heat consumption cannot be reached. Sit-ups can only achieve local fitness effects. Because sit-ups directly target abdominal muscle groups, the effect of long-term exercise may strengthen abdominal muscle strength, but other parts of the body, such as thighs and buttocks, get less exercise. Therefore, only by effectively combining sit-ups with other fitness methods can we achieve a perfect weight loss effect.