Set the two cables to head height. Stand two steps in front of the stack with a braced stance. Hold the handles behind you with slightly bent arms and your thumbs facing upwards.
Take the load as far as you can behind you and then slowly squeeze the chest, until the handles cross over in front of you at chest height.
At the front, really squeeze and contract the chest muscles for a moment and then slowly let the arms move backwards. Try and let them go as far back as possible to fully feel the stretch on the xxxx muscle.