HOW: Sit on the elevated step or surface. Slide one side off of the edge and straighten that leg out. Grab onto the other side of the surface so you can relax the side hanging off of the edge. Let gravity relax your hip down off of the edge. If you need more of a stretch you can reach up and over to the other side.
FEEL: You should feel a stretch in the lower side of your back.
COMPENSATION: Make sure to relax your back and leg that is hanging off of the edge.