This is a great exercise for opening hips, but most of all great pose for relaxation.
To perform it your will need a pillow and block to support your back and two smaller pillows to support your knees.
While performing this pose it is most important to be relaxed and to breathe during the entire pose.
Stay in this position for as long as you would like. When you want to come out of the pose, first slowly pull your knees together and put your body in a fetus position.