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. Lie on your back, put your legs together, raise your hand, use your abdominal muscles to contract, swing your arms forward, quickly put them into a sitting position, and continue to bend forward. Safety instructions:
1. Novices can put their hands on their sides, and when they get used to it or improve their physical fitness, they can cross their hands and stick them on their chests. Finally, try to cross your hands behind your head, but each hand should be placed on the shoulder on the other side of your body.
2. Never put your fingers behind your head, so as not to strain the neck muscles when exerting force, and this will also reduce the workload of abdominal muscles.
Beginners should avoid doing sit-ups too many times at a time. At first, they can try to do it five times, and then increase it once each time until it reaches about 15 times. At this time, they can try to do another group until they reach three groups.