A lot of people feel tension in the trapezius muscle, caused by poor posture, stress, or carrying heavy objects. The trapezius helps to keep our shoulder up. When we hold something in our hand the trapezius is working. When we place a bag over our shoulder the trapezius is working. Also, the trapezius supports our head.
The trapezius only gets a break when we lie down. So, it works for almost the entire day. This is why so many people feel tension in this muscle. Strengthening the trapezius is one way to decrease the tension and support these muscles. The purpose of strengthening your traps is not to hold more stress; it is to stabilize your shoulder blades.