During a Kundalini yoga set, before a workout, or as a rhythmic energiser when you want heat and focus. Always seated and on a fairly empty stomach.
Unlike Kapalabhati, Breath of Fire makes both the inhale and the exhale active and equal, driven by a rhythmic pumping at the navel. The fast rate raises sympathetic arousal and heart rate, generates internal warmth, and blows off carbon dioxide, which is why the tingling and light buzz appear. The insistent, even rhythm is also absorbing, giving the mind a single point to lock onto.
There's little research on Breath of Fire by name; the nearest evidence comes from studies of rapid yogic breathing, which suggest short-term arousal and attention effects. Kundalini yoga programmes that include it have shown benefits for anxiety in some trials, but those bundle it with postures, mantra, and meditation, so the breath's specific contribution can't be isolated. Treat it as an energising practice with a plausible but unproven mechanism.
Breath of Fire is a signature breath of Kundalini Yoga as taught by Yogi Bhajan, who brought the tradition to the West through the 3HO organisation from 1969 onward. It is related to, but distinct from, the classical Kapalabhati kriya, the defining difference is its equal, active inhale and exhale. In practice it is woven together with postures (kriyas), mantra, and body locks.
Learn the equal navel rhythm slowly and seated before adding speed. Start at 15 to 30 seconds and extend gradually over weeks toward a minute or more. Only layer in raised arms or postures once the breath runs on its own without you thinking about it.
Is this the same as Kapalabhati?
No. Breath of Fire uses an equal, active inhale and exhale, while Kapalabhati's inhale is passive. Slow either one down and the difference becomes obvious.
I feel lightheaded. Is that normal?
Mild tingling and lightheadedness come from the fast breathing lowering your CO2 and pass quickly once you slow down. Strong dizziness means ease off. See the safety notes.
How long should a round be?
Start with 15 to 30 seconds and build gradually. Kundalini sets can run for minutes, but only once the breath is second nature.
Safety
Breathwork is a complement to (not a replacement for) professional medical care. If you have a heart, respiratory, or blood-pressure condition, are pregnant, or feel unwell, check with a clinician before practising breath-hold techniques.