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. IyengarIn backbends, one touches the body physically, mentally, intellectually, consciously and spiritually everywhere.
B.K.S. IyengarAs a fire blazes brightly when the covering of ash over it is scattered by the wind, the divine fire within the body shines in all its majesty when the ashes of desire are scattered by the practice of pranayama.
B.K.S. Iyengar