There is no standard for how long sit-ups practice abdominal muscles. It depends on personal circumstances. Moreover, whether abdominal muscles appear mainly depends on the thickness of sebum, and abdominal muscles with fat rate 10% begin to appear. Generally speaking, it takes about 60 days to do sit-ups and practice abdominal muscles. It depends on the individual's amount of exercise and the abdominal body fat rate. If there is a lot of fat in the lower abdomen, you can't see the abdominal muscles. Girls are suitable for 1 1 abdominal muscles, not boys' horizontal style.
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Abdominal exercise tips:
1, weight: The greater the weight used to exercise abdominal muscles, the greater the possibility of irregular movements. The idea that gaining weight can burn more fat is wrong. I suggest you use tension and control instead of weight bearing, and tighten and stimulate abdominal muscles with your mind.
2, continuous tension: when practicing abdominal muscles, keep the abdominal muscles in the whole group constantly tense, no matter the beginning or end of the action, don't let them relax, and always achieve complete exhaustion. Each group must be completely exhausted, not counting the times. Keep doing it until it can't shrink any more. Instead, arch your back slightly and let the tension concentrate on your abdomen. The straighter the upper body stretches. The more force is exerted on the buttocks, the less stress will be exerted on the abdominal muscles.
It is very hard to practice abdominal muscles, which requires a high degree of concentration and willpower to break through the limits of the body. When the body can't bear it, you should stick to your teeth, so that you can exercise your abdominal muscles.
Reference source Baidu Encyclopedia-abdominal muscle practice tips