The common name for the trapezius muscle is the "traps." This large, triangular muscle extends across the upper back and neck. The trapezius plays a crucial role in various movements, including extending the neck and lifting the shoulders. It is also involved in stabilizing and moving the shoulder blades. Strengthening the traps can be beneficial for improving posture and reducing the risk of injury in the upper body. The muscle's distinctive shape resembles a trapezoid, and it consists of three distinct parts: the upper, middle, and lower fibers, each contributing to its functional roles.