What is the standard posture of sit-ups? What parts will you lose when doing sit-ups?

Sit-ups are mainly used to exercise abdominal muscles and have no effect on slimming the abdomen and other parts of the body.

Sit-ups action process:

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.