Set the handles so that they hang at lower chest height. Take grip of the handles, brace your lower back, and tighten your core. Lean back, letting the straps hold your weight. Your arms should be straight and you should have a straight line from your head to your toes. Focusing the tension on your middle back, pull yourself up, maintaining a tight core and ensuring your hips don't drop. Exhale as you do so. Pause at the top of the movement, before slowly lowering yourself back to the start position, inhaling as you do so. Repeat.