Stand with your right foot at the edge of a slightly elevated surface, like a low bench or step, with your left foot hanging off the edge.
Keep your right leg straight, but not locked (hyperextended), during this exercise.
Drop the left side of your pelvis. This will also lower your left foot.
Anchor down strongly into your right heel and draw the right side of your pelvis down to lift the left side of your pelvis up.
Pause and feel for the muscles in your right lateral hip and right butt muscles.
Repeat for several repetitions before moving to the left leg.