If regression is needed, you can do this lying on the ground.

Set up as if you're doing a side plank. Straighten your other leg out to the side so you aren’t rotated toward the ground. Keeping your top hand up, lift your straight leg up to parallel to the ground and then kick it slightly back behind you before lowering it down. Touch the ground behind you. Then lift your leg back up and kick it back forward, tapping your toe down in front of you. You want to almost create a triangle or arch, lifting up center to tap down behind and in front of yourself. Complete all reps on one side before switching. Really pause at the top and feel the outside of your hip and glute working to lift. Complete a full range of motion, moving slowly. Try to keep your body from really wiggling around as you lift forward and backward.