Sure this strech has been tried before...
Im sure this strech has been tried before but Im going to throw it out there and see what kind of success people have had using it.
Here it is:
1) Lay on your back with your knees bent
2) Reach under of your legs and grasp your shaft slightly behind the head
3) Strech your shaft along the underside of your leg and hold for about 30 seconds to start — Ive worked up to holding it up to 2 minutes.
4) While holding your strech move the leg your shaft is streched against forward and the other leg backwards toward your chest.
Enjoy the strech.