Shoulders can only be said that shoulders and backs are not well practiced. Among them, the most easily overlooked and weakest thing for most people is the posterior deltoid muscle bundle. The front beam is strengthened by frequent bench presses and push-ups, and the rear beam is weak because it is difficult to stimulate. It is difficult to open your shoulders when you bend over and lift them horizontally, which is very uncomfortable. The more uncomfortable I am, the less I want to do it.

This causes the front to be strong and the back to be weak, and the scapula is pulled forward, resulting in a shoulder-light shoulder circle. . . The solution is to strengthen the exercise of shoulder and back, and pay special attention to the exercise of deltoid posterior bundle.