1, sit-ups are a form of exercise. Lie on your back, put your legs together, raise your hands, 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, lower your head, and then return to the sitting position. So continuous.
2, practice sit-ups, the speed varies from person to person. You can try to do it five times a minute at first, and then slowly increase it until it reaches about 50 times.
The frequency of sit-ups should be controlled at 60 to 70 times per minute. For practitioners who have a certain fitness foundation, they want to achieve the purpose of strengthening their abdominal strength through practice and ensure that they do it about 60 times a minute.