The imbalance between the left and right muscles is closely related to the habits and movements in life, and also to whether the posture is standardized in training. It is suggested that the right deltoid muscle should increase the training weight on the left side and lift more dumbbells on the left side to increase muscle stimulation. The left pectoralis major needs to know which part of the left pectoralis major is more developed, and make a plan to balance the training intensity on the right according to the left situation.