Shoulder on the stretch side rises
Upper trap shortens; SCM and scalene stretch is reduced.
Overactive muscles
Upper trapeziusLevator scapulae
Corrective work
Foam RollUpper traps↗StretchNeck side stretch (upper trap / levator)↗Upper trap shortens; SCM and scalene stretch is reduced.
Rotation is necessary to isolate the SCM from the scalene.