Lower back arches off the wall
Lumbar extends to compensate for restricted shoulder flexion.
Overactive muscles
Latissimus dorsiErector spinaeHip flexors
Corrective work
Foam RollLats↗Foam RollThoracic spine↗StretchLat stretch (kneeling overhead)↗Lumbar extends to compensate for restricted shoulder flexion.
Pec minor and lats restrict full shoulder flexion.
Suboccipitals and SCM pull head forward; can't maintain neutral neck.