This is a position that stretches the hip abductors and external rotators, as well as provides a stretch in the lumbar region. You can emphasize different areas depending on where you allow yourself to move the most. Lay on your back and cross one leg over your body with the opposite hand. If you just pull on the leg, and try to keep the torso static, you will get a greater stretch through the hip. If you allow your torso to twist in the opposite direction, you will feel a greater stretch through the low back.
Hold 30-60 seconds on each side. If you have limited hip or lumbar mobility, this may be a good stretch for you. To find out if you have adequate lumbar mobility, check our previous post https://ascentpt.wordpress.com/2014/02/05/exercise-of-the-week-mobility-series-lumbar/.