HOW: Start by standing on one leg balanced with the other foot in the air and the knee slightly bent behind you. Perform a single leg squat by reaching the foot in the air behind you and repeat.
FEEL: You will feel all of the leg muscles on the side that is still grounded working.
COMPENSATION: Maintain optimal squat form with your knee not collapsing in or bowing out, do not let your pelvis excessively drop, do not lose your balance.