1) Lie on your side, feet stacked, with your body straight, leaning on your elbow with your forearm pointing forward. Brace your core, front and sides. To do this, imagine a large belt has been tied around your waist and is being pulled to reduce the circumference of your waist.
2) Raise your body off the ground from shoulder to feet so you form a straight line. Hold this position and then reach to the sky with your top arm. Sweep this arm down and across your body, take it from under your body and reach as far back as possible. Your torso starts facing out to the side and finishes facing down as you twist. Untwist and take your arm back to the starting position.
3) Complete this exercise while holding your hips as high as possible and remember to keep your body long and straight throughout. Your movement speed is really important here – stay slow and controlled to get the most out of this exercise.