Come into an all fours position on an exercise mat with your hands directly under shoulders and your knees directly under hips. Gently lift your right hand from the floor and place the hand of that 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. Ideally you should finish with your elbow pointing directly up towards the ceiling. Slowly reverse the movement and return to the start position. Repeat for the recommended amount of time (or reps) before changing to the other side.