HOW: Begin in a single leg squat position with one leg up against the wall. Drive both knees out making sure the foot supporting your weight does not roll outward. Lean close to the wall without making contact with your hips or your shoulders, the knee should be the only body part in contact with the wall. The further your foot is placed away from the wall, the more challenging this exercise will become.
FEEL: The glutes on the leg supporting your weight is where you should feel this the most.
COMPENSATION: Avoid rounding the lower back, allowing your shoulder to touch the wall, or allowing your knee to collapse in.