From the Kay Erdwinn’s Post Teaching Yoga for Round Bodies
The difficult part of this asana for the fat student is the position of the arms and putting the hands together under the back. I simply have the student hold a strap taut between the hands, and otherwise perform the asana as usual. Breathing may be difficult, especially for large-breasted women.
As in Savasana, a cushion under the head may be in order.