When doing sit-ups, people should lie down and lower their center of gravity. The cushion is too soft, which easily makes the waist lose support and makes the lumbar spine uncomfortable. In addition, the movement will be deformed and the movement will not be in place, thus affecting the effect of exercise. The thickness of the cushion doesn't matter much. For example, the thickness of the floor mat in the gym is generally 2-3 cm, and the bed and sofa can be thicker or thinner, which does not affect the exercise. For beginners, sit-ups can be exhausted and do as much as you can. Beginners can be divided into several groups to do exercises, such as 2-3 groups, one group to do 10-20 exercises, rest 1 minute and then do the second group, and so on.

Extended data:

Sit-ups are not only a very important functional activity, but also usually regarded as a method to strengthen abdominal muscles. The purpose of resistance training is also to enhance the strength and control of abdominal muscles. Resistance training is usually considered as a method to improve the overall stability of the trunk.

For people with moderate abdominal weakness, when they try to complete a complete sit-up, they usually show a characteristic posture. When trying to exercise, its muscle activity is mainly hip flexor activity. Therefore, the range of flexion motion of thoracolumbar segment is very small, and the pelvis is excessively flexed prematurely relative to the hip joint. Contraction mainly caused by hip flexors can lead to excessive lumbar lordosis, especially in the initial stage of sit-ups.

References:

Baidu encyclopedia-sit-ups