Align your kneeling knee under your hip.
Align your front knee over your ankle.
DO NOT backbend in this shape!
Tuck your tailbone and drop your rib cage. Pull your breastbone in. Press your pubic bone forward.
Hold for 1 - 2 minutes per side.
I am using a chair here, but you can also do this stretch using a bench, the back of a couch or the wall.