Note that the deep external rotators of the standing leg also facilitate stabilizing the pelvis in Revolved Half Moon Pose. (yogauonline.com)
A change in scapula position or motion may cause an internal rotation of the humerus resulting in a shortened internal rotator muscle (subscapularis) and a stretched or weakened external rotator muscle (teres minor). (postureanalysis.com)
And, typically, other hip extensors — the glute max, posterior gluteus medius and the deep hip external rotators are not functioning well. (arrowptseattle.com)