Stand with a chair parallel to your right side. Stand with your right foot on the chair and your left foot on the floor. Brace your core and place your hands on your hips or out in front of you for balance. Keep your chest up as you drive all your weight through your elevated leg until it's fully extended. All the while exhaling as you do so. Slowly return to the start position by bending at the knee and driving the hips back, inhaling as you do so. Repeat all the required reps on one leg before changing to the other.