Ask a PT Response: "I often find when working with some body builders that they become too focused on working one muscular group and forget to work other muscle(s) or groups. Like you mentioned, this more than likely will result in a muscular imbalance. Weakness of the upper trapezius decreases the ability to extend the cervical spine if weak on both sides and decreases the ability to approximate the acromion and the occiput (shoulder shrug). If you have been developing the musculature in the surrounding areas this could result in additional strain to the upper trapezius as this muscle in its current state may be insufficient for performing the required duties in relationship to the surrounding musculature. Stretching of cervical and shoulder musculature may be recommended based on the findings from the evaluation conducted on my patients along with strengthening exercises. For your case it may be a good idea to consult with a PT for at least an evaluation to determine if the the upper trapezius is indeed involved and to obtian a plan of care tailored to your specific needs. My patients who are experiencing this condiiton often require manual therapy as well to help release trigger points along with joint mobilization technqiues to facilitate proper arthrokinematics once the injury has been sustained. Best of luck to you."