Backbend
http://www.youtube.com/watch?v=pILFQo4qHpA
Stand up straight with your feet shoulder apart,place your hands
on your lower back or above your head. With your knees kept
straight arch your back at the waist as far as you can without
experiencing pain,keep for a few seconds,return to upright
position. repeat a few times each session,do at least three to
four sessions a day.