Shoulders shrug on the raise
Upper traps elevate; the medial delt is underloaded.
Overactive muscles
Upper trapeziusLevator scapulae
Corrective work
Foam RollUpper traps↗StretchLevator scapulae stretch↗Upper traps elevate; the medial delt is underloaded.
Upper trap takes over above the shoulder plane; keep the range to 90 degrees.