Secure a long resistance band around a low anchor point and take the other end in your left hand. Take a few steps back and come to a half-kneeling position, facing the anchor point with your right leg elevated. Your left arm should be extended directly out in front of you, whilst your right hand rests on your right thigh for support. Lean your torso forward slightly, keeping your core braced and a neutral spine. This is your start position. Proceed pull your left hand and elbow back towards the hips and the centre of your spine. Exhale as you do so and squeeze your back muscles. Maintaining control reverse the movement back to the start position. Repeat for the requried number of reps (or time). Repeat all the required reps on one arm before changing to the other. Be sure to change your half-kneeling position too.