HOW: Stand on one leg with a slight bend in your hip and knee. Using a band above the knees, push your opposite knee out and back at a 45 deg angle and hold this position. Keep the knee in the air at a 90-degree angle.
FEEL: You should feel both glutes working, but especially on the side that has the foot on the ground.
COMPENSATION: Don’t let your hips rotate out, don't arch your back, don't let your knee cave in on the side you're standing on, do not lean your torso side-to-side.