Which muscles are typically overactive in association with upper crossed syndrome?

The upper trapezius muscle is considered overactive in individuals with upper crossed syndrome due to its role in maintaining head and shoulder positions that are typically associated with poor postural habits, such as rounded shoulders and forward head posture. In upper crossed syndrome, there is an imbalance between the muscles that stabilize and support the neck and shoulders. The overactivity of the upper trapezius, along with the pectoralis major, leads to increased tension and tightness in these areas, contributing to common symptoms like neck pain and tension headaches.

This muscle, along with the pectoralis major, is often tight in this condition, facilitating the development of a pattern where the neck flexors and scapular stabilizers become weak and inhibited. This muscle imbalance can cause functional issues and discomfort, making it essential to recognize and address the overactivity of the upper trapezius through targeted stretching and strengthening exercises within a comprehensive fitness program.