I just posted another class that warms students up to practice One Footed King Pigeon Pose, Eka Pada Raja Kapotasana.
It includes lots of shoulder and hip flexor stretching and backbending. Check out a full yoga class sequence here.
In the full expression of the pose, the yogi’s head is touching the feet. However, for most of us mere mortals there will be some space there. If your shoulders are not flexible enough to reach back for the toes, use a strap around the ankle for support. Also, always remember to engage Uddyana Bandha when backbending.