Stand in a crescent lunge, lean forward enough to bring the spine in line with the back leg. Roll the shoulders down and back, squeezing the shoulder blades together and pull the elbows back as far as you can. Hinging only at the elbow (no movement in the shoulder) extend the forearm back. Try to get the arms parallel to the floor and hold the extension for a beat before releasing. Keep the neck in the line with the spine.