You've never seen your back, you know. Not really. You've seen pictures or reflections in a mirror, but that's not the same. Your back is unknown territory. Maybe that is part of the reason that bending over backwards is frightening and extreme—and more than a little exciting. To do backbends skillfully and deeply, you must move your attention into the back of your body and move from the back of the body. Staying in the front of the body will create hardness in your organs, strain your breath, and heat your brain.
In some ways, Urdhva Dhanurasana (Upward Bow Pose) is the most important and fundamental backbend. This pose is the culmination of the work done in introductory backbending poses, such as Ustrasana (Camel Pose), Urdhva Mukha Svanasana (Upward-Facing Dog), and Bhujangasana (Cobra Pose).