It's okay! However, the best way to practice abdominal muscles is to do push-ups (keep the mat high, so that the body is 45 degrees, and the standard is to reach the position slowly) or face forward, put your hands on the chair or sofa, and put your feet flat on the chair to do arm flexion. Doing sit-ups is simple and effective to practice abdominal muscles. You can also lie flat on the bed and touch your toes with both hands (lift your body). Do it slowly. If it is fast, there will be inertia, which will affect the effect. Be sure to do it to the end and do it in place. Each group does the limit. Remember not to do it every day, but every other day. Every time you do anaerobic exercise, you should destroy your muscle tissue as much as possible, and then use enough time and nutrition to repair the damaged muscle tissue and let it grow. To put it bluntly, muscles grow out at rest after anaerobic exercise. You also need to lose abdominal fat through aerobic exercise (such as jogging). If you just do sit-ups, the fat layer will not decrease, the muscle layer will thicken and the waist will be thicker. Only scientific fitness can have perfect muscles.