Stand with a chair a short distance to the side of your body. Stand tall with your core braced, a flat back and hands on your hips. Elevate the leg closest to the chair so it is resting atop it and the majority of your weight is in the opposite leg. Brace your core and keep your chest up. Bend first at the knee then at the hips, driving the hips back and down, inhaling as you do so. Lower with control until your thighs are parallel to the floor or deeper depending on your range, making sure your knee is pointing in the same direction as your foot and that your lower back doesn't collapse. Reverse the movement by extending at the knees and driving the hips forward. Exhale as you do so. Repeat all the required reps (or time) on one leg before changing to the other.