Pupils need to warm up in advance when doing sit-ups. Warm up all muscles of the whole body, properly pull apart all joints to avoid muscle strain during exercise.

2. Correct posture

The correct sit-up posture requires lying flat on the floor mat, legs together and straightening, and helping people hold their feet. Put your hands half clenched on both sides of your ears or cross your chest, lift your upper body 45 degrees with the strength of your waist and then put it down, and repeat the above actions.

Extended data:

Precautions for primary school students to do sit-ups;

1, because the body of primary school students is not fully developed and the spine is fragile. When doing sit-ups, don't raise your body to 90, otherwise it will easily cause spinal injury.

2. For people who just started in abdominal muscle training, it is best to do sit-ups in groups, and the number of times at a time should not exceed 10, which can be gradually increased in the future. The total amount of exercise in one day is that there will be no severe muscle pain the next day. ?

3. When doing sit-ups, you should cooperate with reasonable breathing. When doing sit-ups, exhale when leaning forward and inhale when lying on your back. It is best to use only the nose when breathing, and the mouth and nose can be together when exhaling.