Upper Trapezius : Is really a bad guy?

In this video you will understand about how much do we need to emphasis on upper fiber of trapezius. So, it’s about understanding the muscles work together. Let’s not make one muscle is the culprit. The bottom line is unless you’ve had a nerve injury, there is not one muscle that will be totally weak, and even in the case of a spinal accessory nerve injury, it will take out all your trapezius, not just upper fibres.