Round shoulder, also known as chest-containing, refers to the physiological posture that the shoulder bends forward and buckles inward, the chest contracts inward, and the shoulder forms a semi-circular arc. People with round shoulders look insecure, not tall and straight, and look older. You know, under normal circumstances, looking down from the top of your head, our shoulders are in a straight line. However, round shoulders will cause the shoulders to be unable to fully open, and they will appear timid, with poor temperament and no spirit. Whether it is dressing up or talking and behaving, it's a little poor. In addition, round shoulders will not only lead to improper posture, but also affect the related training of your upper body and directly affect your health.