Stand with Neutral Spine, Butterfly and Core engaged.
Extend your right arm forwards, elbow straight and palm facing inwards. Keeping your arm level, swing it to the left, across your chest, and increase the stretch by placing your left forearm outside your right elbow, vertically, and pulling gently in towards your chest.
Hold the stretch for 10-15 seconds until you feel the muscles relax, and then increase the stretch gently. Hold for a further 10-15 seconds.
Release and stretch the other arm.