Loop a long resistance band around a secure anchor point. Ensuring a good distance between yourself and the anchor point, come into an all fours position with your hands directly under shoulders and your knees directly under hips. Your body should be parallel to the anchor point, with your left side facing it. Place the other end of the resistance band around the shoulder joint, at top of your right arm, ensuring the band goes over the top of your back. Place the hand of your right arm at the small of your back, palm facing outwards. This is your start position. Maintaining a flat back and keeping your core braced, rotate through your spine, lifting your chest towards the ceiling and allowing the band to pull your right shoulder towards the anchor point. Ideally you should finish with your elbow pointing directly up towards the ceiling. Repeat for the recommended amount of time (or reps) before changing to the other side.