Kapalabhati

How to do it

1. Sit upright on a chair or the floor with your hands on your knees. Never standing. Breathe normally and let your belly go soft.
2. Breathe out through your nose in one short burst, snapping your belly inward. It takes less than half a second.
3. Release your belly and let the air come back in through your nose without pulling it. That takes a little over half a second. One exhale and one inhale together last one second.
4. Keep going until you've done 30 exhales, one per second. Only your belly works: chest, shoulders and face stay still.
5. Recover with 3 slow breaths through the nose: in for 4 seconds, out for 6.
6. Do two more rounds, each with its 30 exhales and its 3 slow breaths.
7. When you finish, stay seated and breathe at your own pace for a minute before you get up.

What kapalabhati is

The name joins two Sanskrit words, kapala, skull, and bhati, shining, and is usually rendered as skull-shining breath. The mechanics are easy to say and hard to do well: the belly contracts sharply to push out a little air, then lets go so the air returns with no effort. All the work is in the exhale.

That lopsidedness is what separates it from its neighbors. In bhastrika, or bellows breath, you drive the air both in and out. In Kundalini Yoga's breath of fire, the two phases are equal and continuous. In kapalabhati the inhale is passive and slightly longer than the exhale: here, 0.6 seconds against 0.4.

Where it comes from

In the classical manuals, kapalabhati isn't a pranayama at all. It's a cleansing. The Hatha Yoga Pradipika, compiled by Svatmarama in the 15th century, lists it among six purification practices, alongside others like neti and nauli, and says they're meant for people with excess fat or phlegm. Its description is brief: inhale and exhale very quickly, like a blacksmith's bellows. The text says it dries up disorders of phlegm, an idea that belongs to the medicine of its day.

The Gheranda Samhita, probably from the late 17th century, describes three forms. One uses air, alternating nostrils, and two use water passed between the nose and mouth. None of them quite matches what's taught now.

The modern form, with an active exhale and a passive inhale through both nostrils, is the one today's yoga schools pass on and the one researchers use, where it goes by high-frequency yoga breathing. We couldn't establish who settled on that form or when.

What people use it for

In a yoga class it usually comes before pranayama or meditation, as a way of clearing out. Many people practice it in the morning.

Practitioners talk about a clear nose, a warm belly and a brighter head. The name itself points at that feeling. That's a description of the experience, not a proven effect.

What the research says

Kapalabhati is the most studied of the fast breaths, nearly always in young, healthy, experienced men. A 2011 study of 38 men measured it at one exhale per second for fifteen minutes. During practice, several heart rate variability measures tied to the vagus nerve went down. In other words, it activates; it doesn't calm.

In 2015 the same group measured metabolism in 47 practitioners. During kapalabhati, oxygen use rose 34.6%, ventilation nearly tripled, and estimated blood carbon dioxide fell 25 to 29%. Participants didn't report hyperventilation symptoms, but the number shows the practice does lower carbon dioxide.

A 2022 study of 20 practitioners, with no control group, sums up the state of the field: findings on the brain and nervous system are mixed and inconclusive.

There's also a report of harm. In 2004 the journal Chest published the case of a healthy 29-year-old woman who came to the emergency room with a spontaneous pneumothorax, air outside the lung, attributed to this practice. According to its authors, it's the only known case.

What it feels like and what to notice

The first few times, your abs will probably tire before you reach thirty. That muscle fatigue is normal. So is needing a tissue.

What you shouldn't brush off are signs that carbon dioxide has dropped too far. Cleveland Clinic explains that hyperventilation narrows blood vessels, including the ones to the brain, and that's where the dizziness, weakness, tingling in the arms or around the mouth, and headache come from. If you notice any of them, the round ends there.

The three slow breaths of 4 and 6 seconds aren't decoration. They're when your body rebalances. Take them in full, without hurrying back to the exhales.

Variations

• Gentler: one round of ten or fifteen exhales, with less force, and the full recovery.
• Slower: one exhale every two seconds. Good for learning to release the belly between bursts.
• Faster: some studies and schools use two exhales per second. That's a variation for experienced people with a teacher, not a goal.
• The Gheranda Samhita's version: its air form alternates nostrils instead of using both at once. It has more in common with alternate nostril breathing than with this guide.

Common mistakes

• Pulling the air in. If the inhale takes effort, it's turned into bellows breath. Just release your belly.
• Exhaling from the chest. The burst comes from below the navel. A hand on your belly will tell you.
• Grimacing or bouncing your shoulders. Extra force ends up in your face. Dial it down.
• Practicing congested or on a full stomach. Wait for a better moment.
• Stacking rounds with no recovery. Without the slow breaths, the dizziness shows up sooner.

How often and how long

Three rounds of thirty, three minutes, once a day: that's a reasonable practice without a teacher. The studies used sessions of five to fifteen minutes, but with trained people under observation, and researchers advise against overdoing it.

Start with one round, and add the second and third once the first stays even from beginning to end. There's no evidence that more time is better, and there are reasons to be careful.

Before you start

• Practice sitting, with your back upright. Never standing.
• Never in or near water, and never while driving.
• Stop and breathe normally if you feel dizzy, tingly, short of breath, or get a headache or chest pain.
• Ask a health professional first if you're pregnant, or have a heart, lung or blood pressure condition, epilepsy, a hernia or recent abdominal surgery, or a history of fainting or panic attacks.
• This is a practice for adults. Keep it light: the belly works, the rest of you doesn't.