Backbends are to be felt more than expressed. The other postures can be expressed and then felt. Like in meditation each person has to feel backbends.
B.K.S. IyengarPersistent practice alone is the key to yoga. As you take pains to learn, continue with devotion what you have learn.
B.K.S. IyengarYoga is like music: the rhythm of the body, the melody of the mind, and the harmony of the soul create the symphony of life.
B.K.S. Iyengar