At the same time the engagement of abductors of the thigh and stabilizing muscles is a lot lower. (fitnessandpower.com)
Next, I use sequential muscular engagement to lift the back leg in Revolved Half Moon Pose, beginning with the hip abductors of the standing leg. (yogauonline.com)
(Figure 3: Engaging the hip abductors in Revolved Triangle Pose.) (yogauonline.com)