That's the beauty of backbends. Emotionally we can never be disturbed, for the emotional centre becomes an extrovert. When you do Viparita Dandasana, your head looks backwards, but your conscious mind stretches everywhere. Study by observing how the mind gets regulated. You not only know the freedom in the spine, but also the freedom in the spirit.
B.K.S. IyengarIf the foundation is firm the building can withstand calamities. The practice of yoga is the foundation so that the self is not shaken under any circumstances.
B.K.S. Iyengar