“As Uḍḍīyāna Bandha is done on holding the breath after exhalation,
one of the most important requirements
is that we are able to do a long holding of the breath
without sacrificing the quality of the inhalation and exhalation.
If this is not possible we should forget about Bandha for the time being.”
– TKV Desikachar ‘The Concept, Preparation and Techniques of Bandha’
Religiousness in Yoga Chapter Fourteen Page 197