Shoulders shrug instead of retracting
Elevation instead of retraction; mid-back never loads.
Overactive muscles
Upper trapeziusLevator scapulae
Corrective work
Foam RollUpper traps↗StretchLevator scapulae stretch↗Elevation instead of retraction; mid-back never loads.
Suboccipitals and cervical extensors brace against the effort.