Beginners should avoid doing sit-ups too many times at a time. At first, they can try to do it five times, and then add it once in each exercise until it reaches about 15 times. At this time, they can try to do another group until they reach three groups.

The correct way to do sit-ups is as follows: lie on your back on the floor mat, with your knees bent about 90 degrees and your feet flat on the ground. Don't fix your feet on the flat ground (for example, your partner presses your ankles with his hands), otherwise the flexors of thighs and buttocks will also join the work, thus reducing the workload of abdominal muscles. Furthermore, straight leg sit-ups will increase the burden on the back and easily cause damage to the back. Determine the position of your hands according to the strength of your abdominal muscles, because the closer your hands are to your head, the more difficult it will be to do sit-ups. 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 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. Never cross 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.