“My understanding of Prāṇāyāma is that the Kumbhaka should be an aid.
The aim is to get a feeling difficult to put into words, but different from normal states.
The question is how much does Kumbhaka play a part in this?
So Investigate the use of Kumbhaka and only use it when it helps you be with the breath.”
– TKV Desikachar Switzerland 1978