From Happy Baby, release hold of your feet, and place your right ankle on your left thigh above your knee. See the shape of the number four? It is there, just upside down.
Reach your right hand through the open space created by your right leg, and grab your left hand, which is reaching around the outside of your left thigh. Slowly bend your left knee toward your chest. You should feel a stretch on the outside of your right hip.
Enjoy this stretch for your piriformis muscle for 30 seconds, then repeat on the other side.