Abdominal muscle asymmetry has two factors.

The first one is that people are born with abdominal muscle asymmetry. If this is the case, don’t worry, it is a normal phenomenon.

The second is if you find that the abdominal muscles are very strong on one side and very weak on the other. The reason is that when doing sit-ups, the direction, center of gravity, and focus of the exercise may not be accurate enough. These are all acquired bad habits. If it is caused by uneven exercise, it needs to be adjusted.