HOW: Start in a standing position balancing on one leg with your hands holding onto a sturdy surface/object to help with balance. Perform a skater squat by bending at your hip and knee, also let your upper body lean forward by hinging at your hip. Return to starting position, repeat.
FEEL: You should feel all the muscles in your leg working, especially your glutes and your quadriceps. You may feel your core working as well to maintain torso position.
COMPENSATION: Do not lose balance, try to keep your knee tracking over your foot, do not let your knee cave in/out. Do not let your pelvis sag on the other side. Do not over-rely on upper body support.