Structured counts

Box breathing: the four-count from police training

By GyroscopeUpdated November 15, 202612 sources

Family

Structured counts

Breaths

3.75 a minute

Carbon dioxide

Steady, a little higher on the holds

How well tested

Weak

Risk

Low

Timer

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Box breathing is four equal sides of four seconds each, in, hold, out, hold. It’s easy to remember when your heart is pounding, and small trials show it takes the edge off stress in the moment. It’s also slower than most people think, at 3.75 breaths a minute, and it has thinner evidence than cyclic sighing.

Box breathing has the best story in breathwork. It’s sold as the Navy SEAL technique, and a pattern trusted by people who walk into danger for a living sounds like it must be the strongest one. The story is mostly true. It just tells you who uses it, and police and soldiers were using it long before anyone ran a trial. When researchers finally did, box breathing held its own in the moment without beating the alternatives.

What it is and where it comes from

The count comes out of police training. In 1986, Charles Remsberg’s police book The Tactical Edge described a “Belly Breath.” You sit down, close your eyes, breathe in through your nose for a slow four, pause for four, breathe out through your mouth for four and pause for four. A police officer writing in Police Magazine in 2017 said he first came across it at the police academy in 1991.

It spread under other names. Lt. Col. David Grossman teaches the same count as “Combat Breathing.” German military researchers cite his book On Combat, written with Loren Christensen, for tactical breathing, which soldiers and police use to stay steady in danger. They describe it as four equal phases of four counts, often taught in soldiers’ basic training.

The name that stuck came from a SEAL. Mark Divine, a retired Navy SEAL commander who founded the SEALFIT training program, named it “Box Breathing” because the four even counts are like the four sides of a box.

How to do it

1. Sit with your feet flat. Breathe all the way out to start.
2. Breathe in through your nose for four. Fill up without straining.
3. Hold for four. Keep your throat and shoulders loose.
4. Breathe out for four. Through your nose or mouth.
5. Hold empty for four. Then start the next box.
6. Repeat. A minute or two before a hard moment, or five minutes as a practice, which is about 19 boxes.

If four feels long, use three. The Police Magazine piece suggests 3-3-3-3 suits some people better. In the Stanford trial, people who could breathe out slowly for longer got longer counts, up to 8 to 10 seconds a side.

The shapes below show how much slower box is than six a minute. In the same 40 seconds, box fits two and a half breaths and six a minute fits four.

A simple way to picture it

Box breathing is a four-way stop. You roll forward, come to a full stop, roll forward again and stop again, and every leg takes the same time. The stops are what make the trip slow.

What happens in your body

A resting adult takes 12 to 18 breaths a minute. A 16-second box brings that down to 3.75, and slow breathing like this lets your heart’s brake work longer on each breath. Box gives the out-breath the same time as the in-breath, though, so it doesn’t lean on the calming half the way cyclic sighing or an extended exhale does.

The holds are the unusual part. During a hold, your brainstem keeps its breathing rhythm going, and you just hold your chest still. The Brigham Young team expected square breathing and 4-7-8 to raise carbon dioxide a little. In their study, it was the pattern without holds, six a minute, that tipped students into mild over-breathing. The long version is in breath holds.

The same holds work against you when your body needs air. After hard interval training, box breathing pushed heart rate higher than six a minute did, and people rated the effort as harder.

What the evidence shows

A 2026 review found eight randomized trials of box breathing. Several showed short-term drops in stress, anxiety and bad mood, the effects on heart rate and HRV were mixed, and the trials used different counts on very different people. In a German armed forces lab study, 30 people tried tactical breathing and a long out-breath during a stressful task. They felt about the same with both. Tactical breathing calmed their bodies more, and the long out-breath got them better task scores. The review found little long-term follow-up.

Who should skip it

Nobody needs to skip it, but plenty of people should change it. If the holds leave you lightheaded, anxious or gasping, cut them to two seconds or drop them and switch to six a minute, which is still slow and has no holds. If you’re out of breath after exercise, let your breathing recover first. A 2006 review found people can’t hold their breath until they black out, because a reflex forces the next breath first. The risky holds are long ones after fast breathing, covered in who should skip which breathing exercises.