While it may be handy to observe deep belly breathing, it does not in by itself entail the factors of yogic pranayama. Insisting on an entire breath just isn't a thing that ancient yogic texts take care of possibly. I think of it more as a preliminary. Several breathwork https://power-breathwork09752.onesmablog.com/not-known-factual-statements-about-simhasana-pranayama-tutorial-59225735