Lie with your back flat on an exercise mat and a chair (or equivalent platform) placed horizontally in front of you. Place the heel of your right foot atop the edge of the chair, whilst keeping your left leg in the air. Ensure that your pelvis is tucked forward (ensuring you have no arch in your back whilst lying down). Focusing the tension in your right glute, drive your hips up to full hip extension, exhaling as you do so. Make sure to keep your heel pressed firmly into the chair. Pause for a count of one when your hips reach full hip extension, keeping the tension in your glute and then return with control to the start position, inhaling as you do so. Repeat all the required reps on one leg before changing to the other