Shrugging at the top
Upper traps elevate the shoulder girdle instead of the deltoid abducting the humerus.
Overactive muscles
Upper trapeziusLevator scapulae
Corrective work
Foam RollUpper traps↗StretchUpper trap doorframe stretch↗Upper traps elevate the shoulder girdle instead of the deltoid abducting the humerus.
Significant elbow flexion shortens the lever and reduces deltoid demand.
Misaligned seat puts shear stress on the shoulder joint rather than pure abduction torque.