Kapalabhati

A rapid, forced exhale with a passive inhale, repeated in rounds. It is one of the kriyas — cleansing practices — rather than a pranayama proper, and it is stimulating, not calming. People who meet it expecting relaxation have a bad time.

The mechanics

The exhale is active. A sharp, short contraction of the lower abdomen snaps the belly inward, which pushes the diaphragm up and forces air out through the nose. It is a pump, driven by the abdominal wall.

The inhale is passive. You do not breathe in. You release the abdominal contraction, the belly falls back out, the diaphragm drops, and air comes in on its own. Trying to inhale actively is the most common error and it makes the practice exhausting within twenty breaths.

The chest stays still. All the movement is below the ribs. If your shoulders are rising, you are recruiting the wrong muscles.

How to do it

Sit up. Hips higher than knees, spine stacked, hands on the knees. Never lying down.

Find the movement first, slowly. Put one hand on your belly, just below the navel. Exhale sharply through the nose by pulling the belly in — like a short, hard sniff in reverse. Then let go completely and feel the belly fall out and the air arrive on its own.

Do that ten times at one breath per second. Slowly enough that you can feel both halves.

Then build the rate. The working pace is roughly one to two per second — sixty to 120 a minute. Faster is not better.

Rounds. Twenty pumps, then stop and breathe normally for thirty seconds to a minute. That is one round.

How many

Weeks one to two: three rounds of twenty. That is it.

Weeks three to six: three rounds of thirty.

Months in: three rounds of fifty. Some traditions build to 108 per round.

Rest fully between rounds and pay attention to that rest — the after-effect during the rest is arguably the point of the practice, and rushing on to the next round skips it.

Once a day is enough. Morning, on an empty stomach.

What to expect

During: effort in the lower abdomen. It should feel like exercise for that muscle group, because it is.

Immediately after a round: a distinct quiet. The breath is naturally suspended for a moment and there is a period of stillness before the next breath arrives on its own. Sit in it.

After three rounds: alert, warm, slightly buzzing. Clear-headed. This is a stimulant practice and it works like one.

Not: calm, sleepy, or settled. If you want that, do a long-exhale practice instead.

The four errors

1. Actively inhaling. By far the most common. You will tire in thirty seconds and conclude you are unfit. The inhale is a release, not an action.

2. Moving the chest and shoulders. Recruiting the upper body means the abdominal pump is not doing the work. Put a hand on your chest — it should barely move.

3. Going too fast, too soon. The rate is the last thing to build, after the mechanism is correct. Fast and wrong is a worse practice than slow and right, and considerably more tiring.

4. Too many rounds. Enthusiasm produces light-headedness and headaches. Three rounds, and stop.

Light-headedness

Common in the first weeks, and it means you are over-breathing — moving too much air and dropping carbon dioxide too far.

If it happens: stop, breathe normally for a minute or two, and reduce either the rate or the number of pumps next round. It is a signal to do less, not to push through.

If it happens every time even at low volume, this practice is not for you at the moment. There is nothing in it you cannot get elsewhere.

When it is the wrong choice

Skip it entirely, and ask someone qualified, if any of these apply:

• Pregnancy. Do not do this practice.
• Uncontrolled high blood pressure, or a heart condition.
• Recent abdominal surgery, or an abdominal hernia.
• Epilepsy.
• Glaucoma or retinal problems.
• Menstruation — traditionally omitted, and many teachers still advise it.
• Any acute abdominal condition — ulcers, active digestive illness.
• Recently after eating. Two hours minimum, four after a large meal.
• Anxiety or panic history. It is a sympathetic-activating practice and it can trigger exactly the state you are trying to avoid. Approach carefully or not at all.

What it is actually for

Abdominal strength and diaphragm control. It trains a fast, coordinated contraction of the abdominal wall, and it improves your control over the diaphragm considerably.

Clearing the nasal passages and airway. The traditional claim, and observably true — it is a cleansing practice in a mechanically literal sense.

Waking up. As a morning practice it does what it says. Three rounds and a short sit is a genuinely effective way to start.

Preparation for retention. Traditionally, kapalabhati precedes work with kumbhaka. Whether you go there is a separate question.

The claims about detoxification and fat burning are not supported. Skip them; the four above are real.

Where it fits

At the start of a session, after settling and before asana. Or as a standalone morning practice with a short sit afterwards.

Never at night. It will keep you awake, which is the honest measure of the fact that it works.