When the asana is correct, there is lightness, a freedom. Freedom comes when every part of the body is active. Let us be free in whatever posture we are doing. Let us be full in whatever we do.
B.K.S. IyengarI also say with backbends, you have to be cautiously bold. Not carelessly bold. You have to descend to the dictation of the spine. You cannot command from the brain to do the poses. As you play with a child, guarding the child from injuries, similarly you have to play in backbends, guarding your spine.
B.K.S. IyengarMind is the king of the senses; breath is the king of the mind; and the nerves are king of the breath.
B.K.S. Iyengar