HOW: Stand on an elevated surface with one foot off of the ledge. Lower the elevated foot by dropping your pelvis. Elevate your pelvis on that leg by using your glute muscles on the stance leg. If you have your hands on your pelvis you may be able to better understand when the side off of the edge is lower and elevated.
FEEL: You will feel the outer hip muscles on the leg you are standing on work with this exercise.
COMPENSATION: Avoid bending your knee to lower the opposite leg. Most of the motion should come from the pelvis with this exercise.