2. When doing abdominal muscle training, to keep the trunk straight, you need to use abdominal muscles. If a person is forced to exercise because of the lack of waist and abdominal muscles, he must get up in other ways, which will cause great pressure on the waist muscles and easily strain them. The solution can be to reduce the intensity of training, such as reducing the number of groups, adopting a posture with head high and feet low to prevent muscle strain caused by excessive use, and then consider changing the training method until your waist and abdomen muscle strength is improved.