Sit-ups if the action is not standard, will cause a certain degree of damage to the lumbar spine and cervical spine, the reasons are as follows: First, do sit-ups mainly exercise abdominal muscles, so the abdominal muscles should be made throughout the force, to avoid borrowing power in the iliopsoas muscle, such as iliopsoas muscle borrowing, can lead to symptoms of lumbar pain, and at the same time to do sit-ups cervical spine should not be over-flexed, or it will lead to neck pain. Secondly, when doing sit-ups, the power is close to exhaustion, usually with the help of explosive force to complete the last few movements, at this time the lumbar force is completely exhausted, the lumbar spine loses the protection of lumbar muscles, which is easy to cause lumbar spine injuries, and the neck is easy to excessive activities leading to cervical spine injuries. In summary, sit-ups should be standardized, not to use explosive force and inertia to complete the action, otherwise it will cause damage to the cervical spine and lumbar spine.