Today a lot of people spend large amount of their time by sitting in front of a desk or computer, and have inactive lifestyles. As a result, many people develop bad side e ects such as forward head posture. Forward head posture is extremely common today, and people su er symptoms such as poor breathing and neck and back pain. We think that our modi cation can show well the movement of shoulder verti- cally and horizontally. By exercising and maximizing the movement of shoulders, forward head posture can be prevented and corrected.