"The muscles near the neck on the left shoulder are obviously more developed than those near the neck on the right shoulder."

Analyze your reasons:

1, your left arm is stronger than your right arm;

2. Your arm participates in sports more strongly than your right arm;

Improvement method:

Balanced motion method. In the past, your left arm may participate in high-intensity exercise, but now your right arm participates in high-intensity exercise, so that the muscles on the right side can "catch up" and then train with the same intensity. Be careful not to use one-handed flat lifting and other actions in the future, and use two hands instead.