“We must begin to do these Bandha in some
simple postures so our bodies can get used to them.
The easiest posture is to lie flat on the back.
We call this Taḍāka Mudrā when we
do Uḍḍīyana Bandha in this position.”
– TKV Desikachar ‘The Concept, Preparation and Techniques of Bandha’
– TKV Desikachar Religiousness in Yoga Chapter Fourteen Page 197