Benefits
"The pose rejuvenates the spine and is specially recommended for people suffering from a stiff back.  The movement is good for persons with lumbago, sciatica and those suffering from slipped or prolapsed discs of the spine.  The pose strengthens the spine and cures backaches.  Due to chest expansion, the lungs gain elasticity.  The blood circulates properly in the pelvic region and keeps it healthy." Light On Yoga by B.K.S. Iyengar