I received the following question by Mail:
"at yoga vidya i learn in Kapalabhati to hold the breath after the exhalation... then inhale and hold kumbhaka once again as normally. I wanted to know the effects of holding after exhalation... "
Here is my answer:
holding the breath after exhalation: This is a more advanced practice - some students feel more awakening of energy, many can do longer Kumbhaka after inhalation afterwards. If one feels a good effect, one can hold the breath after exhalation for a few seconds, otherwise you can do without it.
Anybody wants to add to it?