Rotation comes from the lumbar not thoracic
The spine twists at the lumbar; thoracic stays stiff.
Overactive muscles
Erector spinaeLatissimus dorsi
Corrective work
Foam RollThoracic spine↗StretchOpen book stretch↗The spine twists at the lumbar; thoracic stays stiff.
Adductors and TFL destabilize the base during the rotation.