Box breathing: the guided 4-4-4-4 exercise

Box breathing repeats four equal counts: breathe in for 4 seconds, hold for 4 seconds, breathe out for 4 seconds, then stay empty for 4 seconds before starting again. One trip around the box takes 16 seconds. In the guide below, a dot travels around the square, one side per step.

Guided exercise

In 4 s · hold 4 s · out 4 s · hold 4 s

StartStopClose Restart

Length: 1 minLength: 3 minLength: 5 min

The guide always ends on a full square (4, 11 or 19 rounds).

How to do box breathing

Get settled. Sit upright with your shoulders down. You can keep your eyes open.
Gently empty your lungs. One easy exhale gives you a clear starting point.
Breathe in through your nose for 4 seconds. The dot climbs the left side.
Hold for 4 seconds with full lungs. Don’t lock your throat or tense your shoulders: it’s simply a pause.
Breathe out for 4 seconds. Through your nose if you can, smoothly, all the way out.
Stay empty for 4 seconds. Then start a new round, for 1 to 5 minutes.

Four seconds is a starting point, not a rule. In the Stanford study described below, the length of each side was set for each participant, anywhere from 3 to 10 seconds, and the instruction was clear: the moment you have to strain, shorten it. If a 4-second hold feels like too much, drop to 3.

Where does box breathing come from?

You’ll often see it called “the Navy SEAL technique.” The real story is more nuanced. In a 2016 essay for TIME, former Navy SEAL Mark Divine described box breathing as his favorite practice, one he developed to continue his breath training after his time in the SEALs. Cleveland Clinic says it’s used by the Navy SEALs and links it to pranayama, the yogic practice of focusing on the breath, where it’s known as sama vritti pranayama. We found no official military source describing it as a standard method.

The name comes from the shape: a box has four equal sides, just like the four counts.

What the research says

The Stanford study (Balban and colleagues, 2023)

This is the study everyone cites. A Stanford University team randomly assigned 108 adults to four groups, who practiced 5 minutes a day for 28 days, at home: cyclic sighing (a double inhale followed by a long exhale), box breathing, cyclic hyperventilation with breath retention, or mindfulness meditation.

Positive mood: the three breathing groups, taken together, improved it more than meditation did. Taken one by one, only cyclic sighing clearly stood out; box breathing did better than meditation, but not by a significant margin.
Anxiety and negative mood: both went down in every group, with no difference between breathing and meditation.
Resting breathing rate: it dropped more with the breathing exercises than with meditation.

The authors list their limits: a remote study, small groups (21 people did box breathing), four weeks with no follow-up, and a protocol registered after the fact.

Compared with breathing at 6 breaths a minute

In 2025, 84 college students tried box breathing, 4-7-8 breathing and breathing at 6 breaths a minute (Marchant and colleagues). Box breathing raised heart rate variability less than 6 breaths a minute did, and none of the patterns tested meaningfully changed mood or blood pressure after a single session.

Bottom line: box breathing is a simple way to slow down and give your attention a rhythm to hold on to. Its specific effects are still under-studied, and in the best study available, it did about as well as meditation for anxiety.

When to use box breathing

Its steady, easy-to-remember rhythm makes it handy when you need to regroup without anyone noticing:

before an exam, a job interview or a presentation;
between two tasks, to draw a line under the last one;
when your thoughts are racing and counting helps slow them down.

Mark Divine recommends at least five minutes, or short one- to two-minute sessions during the day. At bedtime, breathing without breath holds and with a longer exhale is often easier: try our breathing exercise for sleep.

Is box breathing safe?

Never force the holds. If you feel short of breath or tense, shorten all four counts.
Lightheaded or tingly? That’s a sign you’re breathing too hard. Breathe more gently, or take a break.
Never in water. Holding your breath or hyperventilating before going underwater can make you black out.
Ask your doctor first if you’re pregnant or have a heart or lung condition, glaucoma or epilepsy: the Stanford study excluded these conditions as a precaution.

Selfia is not a medical device. If you’re struggling or thinking about suicide, help is available: in the US, call or text 988; in the UK and Ireland, call Samaritans on 116 123; anywhere else, find a local line at findahelpline.com.

Frequently asked questions

How long should you do box breathing?

One to five minutes is enough for a break. In the Stanford study, participants practiced 5 minutes a day. Mark Divine, who popularized it, recommends at least five minutes, or short one- to two-minute sessions throughout the day. The guide on this page offers 1, 3 or 5 minutes and always stops at the end of a full round.

Why is it called box breathing?

Because, like a box, the exercise has four sides of equal length. Breathing in, holding, breathing out and pausing on empty all last the same time, most often 4 seconds. It’s also called square breathing or, in yoga, sama vritti pranayama.

Box breathing or coherent breathing?

Both slow your breathing down. Box breathing adds two holds and works well when you want to regroup quickly. Coherent breathing, with no holds at 6 breaths a minute, is easier to keep up for 5 minutes, and it raised heart rate variability the most in the study that compared the two.

Is box breathing dangerous?

For a healthy person, 4-second holds on dry land carry few known risks. Stop if you feel dizzy, shorten the counts if you’re straining, never do it in water, and check with your doctor if you’re pregnant or have a heart or lung condition.