Box Breathing: How to Do It, What the Research Shows and Who Should Modify It
Box breathing is a simple four-step breathing pattern: breathe in, hold, breathe out, hold, each for the same count. This guide shows you exactly how to do it, how to adjust the counts to your body, and what research actually says about it. You will also learn who should shorten the holds or skip them.
This article is for information only and is not medical advice. Talk to a doctor before starting breathing exercises if you have a heart or lung condition, an anxiety or panic disorder, or are pregnant.
What is box breathing?
Box breathing, also called square breathing or 4-4-4-4 breathing, splits each breath into four equal parts. Picture tracing the four sides of a square. One side is the in-breath, one a pause, one the out-breath and one a second pause. The most common version uses a count of four for each side.
The appeal is how little it asks of you. There is nothing to buy and nothing to learn beyond counting. You can do it sitting at a desk, waiting in a car park or lying in bed. Because the pattern gives your attention a job, many people find it easier than simply being told to “relax”.
1. Breathe in · 4
2. Hold · 4
3. Breathe out · 4
4. Hold · 4
One full square
≈ 16 seconds
Trace the square clockwise. Each side is one phase of the breath.
Where box breathing comes from
The name and the modern method are usually credited to Mark Divine, a former US Navy SEAL. Writing in TIME in 2016, he said he first learned breath control through martial arts during SEAL training. He described box breathing as something he developed afterward to continue that training. It has since been taught widely in police, military and sports settings.
The idea of an equal-count breath is much older. Yoga traditions describe sama vritti, meaning “equal fluctuation”, a pranayama where inhale and exhale share the same length. Yogic texts also describe kumbhaka, the retention of breath. Antara kumbhaka is the pause after inhaling, and bahya kumbhaka is the pause after exhaling. Box breathing combines these elements in a simple, secular form. For the wider tradition, see our guide to pranayama breathing practices.
How to do box breathing: step by step
Set aside five minutes for your first try. The NHS suggests practicing a calming breathing exercise for at least five minutes, and doing it regularly rather than only in a crisis. Sit in a chair that supports your back, with both feet flat on the floor.
- Settle. Loosen anything tight around your waist or chest. Rest your hands on your thighs. Let your shoulders drop.
- Empty your lungs. Breathe out gently through your mouth until your lungs feel comfortably empty, not squeezed.
- Breathe in for four. Inhale slowly through your nose for a count of four. Let the breath move down into your belly rather than lifting your shoulders.
- Hold for four. Pause with your lungs comfortably full. Keep your throat and jaw soft. The hold should feel like a resting point, not a strain.
- Breathe out for four. Exhale slowly and evenly for a count of four, through your nose or gently parted lips.
- Hold for four. Pause with your lungs empty. If this feels uncomfortable, shorten it.
- Repeat. Continue for four to eight rounds, or about five minutes. Then let your breathing return to normal and notice how you feel.
Count at a steady, unhurried pace, roughly one count per second. If you lose count, simply start the next square again from one. Getting distracted and returning is part of the practice, not a failure.
Steady, slightly slower than usual, and comfortable. If you feel dizzy, light-headed, tingly or breathless, stop and breathe normally. Those are signs that the counts are too long or the breaths too deep for you right now.
Choosing your count: box breathing variations
Four is a starting point, not a rule. People differ in lung size, fitness and comfort with breath holds. A count that feels easy for one person can leave another gasping.
The 2023 Stanford trial described below took this seriously. Researchers set each participant’s count using a short breath-hold test. Counts ranged from three to four seconds for some people up to eight to ten seconds for others. You can use the same logic informally: pick the count that lets you finish five minutes without strain.
| Version | Pattern | Breaths per minute | Good for |
|---|---|---|---|
| Gentle square | 3-3-3-3 | About 5 | Beginners, smaller lungs, older adults |
| Classic box | 4-4-4-4 | About 4 | Most healthy adults |
| Longer box | 5-5-5-5 or 6-6-6-6 | About 2 to 3 | Experienced, comfortable practitioners |
| Short-hold box | 4-2-4-2 | About 5 | Anyone who finds holds uncomfortable |
| No-hold (equal breathing) | 4 in, 4 out | About 7.5 | Pregnancy, panic-prone, heart or lung conditions |
Breaths per minute assume one count per second. All versions sit at or below the “slow breathing” range used in research.
Notice that every option slows breathing well below the typical resting rate. That slowing, rather than the square shape itself, is what most research on calm breathing focuses on.
Does box breathing work? What the research shows
Box breathing is widely recommended, but it has been studied directly much less than its popularity suggests. The best evidence comes from one direct trial and from broader research on slow breathing.
The 2023 Stanford trial
Balban and colleagues published a randomized trial in Cell Reports Medicine in 2023. They assigned 108 adults to one of four five-minute daily practices for 28 days. The groups did box breathing, cyclic sighing, cyclic hyperventilation with breath holds, or mindfulness meditation.
| Question | What the trial found |
|---|---|
| Did box breathing help mood? | Yes. Positive mood rose and anxiety and negative mood fell in every group, including box breathing. |
| Was it better than mindfulness? | Not significantly. Its gains were similar to mindfulness meditation. |
| Which practice stood out? | Cyclic sighing, which emphasizes long exhales, was the only one that beat mindfulness on positive mood and breathing rate. |
| Did heart rate or sleep change? | No significant changes in heart rate variability, resting heart rate or sleep. |
| How strong is this evidence? | Limited. The box breathing group had only 21 people, practice was self-reported, and follow-up lasted four weeks. |
The authors also noted that most participants came from one university class. The lead author disclosed an advisory role with a wearable-device company. None of this cancels the results, but it does mean they need confirming in larger studies.
What broader research on slow breathing shows
A 2018 systematic review by Zaccaro and colleagues looked at 15 studies of slow breathing in healthy adults. Slow breathing meant fewer than 10 breaths per minute, a range every box breathing version falls into. Participants reported feeling more relaxed, comfortable and alert, with less anxiety and anger. Slow breathing also increased heart rate variability, a marker linked to the body’s “rest and digest” system.
The review’s authors were careful about limits. The studies were small, used different techniques and included no randomized controlled trials. A pooled analysis was not possible.
The US National Center for Complementary and Integrative Health (NCCIH) reaches a similar view about breathing and relaxation techniques generally. It says slow or diaphragmatic breathing may help reduce stress. It reports that a 2019 review found slow breathing gave a modest drop in blood pressure. NCCIH also stresses that much of this evidence is low quality or based on small studies.
An honest summary
| Claim you will see online | What the evidence supports |
|---|---|
| “Box breathing calms you down.” | Reasonable. Short-term improvements in mood and anxiety appear in a small trial and in slow-breathing research. |
| “It’s the best breathing technique.” | Not supported. In the one head-to-head trial, cyclic sighing did better, and box breathing matched mindfulness. |
| “It cures anxiety.” | No. It may ease feelings of stress, but anxiety disorders need professional care. |
| “It lowers blood pressure.” | Slow breathing in general may give a modest drop. It does not replace prescribed treatment. |
| “It improves sleep.” | Unproven. The 2023 trial found no sleep changes, and NCCIH calls relaxation alone not especially promising for sleep. |
Why slow breathing may help: the likely mechanism
Your heart rate naturally rises a little as you breathe in and falls as you breathe out. This rhythm is called respiratory sinus arrhythmia. Slow breathing exaggerates it, which shows up as higher heart rate variability in studies.
Researchers read this as a shift toward the parasympathetic nervous system, the branch associated with rest. Counting may matter too. Giving your mind a simple task can interrupt a loop of worried thoughts, much as mindfulness does. That may explain why box breathing and mindfulness performed similarly in the Stanford trial.
The exhale seems to be important. Cyclic sighing, which stretches the out-breath, did best in that trial. If box breathing feels helpful, you can experiment with a slightly longer exhale, such as 4-4-6-2. That small change is safe for most people and moves the pattern toward the strongest result in the research.
Is box breathing safe? Who should modify it
NCCIH describes relaxation techniques as generally safe for healthy people, and most studies report no negative effects. It also notes that some people feel more anxious, have intrusive thoughts or fear losing control. Rarely, these practices may worsen symptoms in people with certain psychiatric conditions or a history of trauma.
Breath holds are the part most likely to cause trouble. The table below shows simple adjustments.
| If you… | Try this instead |
|---|---|
| Are pregnant | Skip the holds and use equal in-and-out breathing. Check with your midwife or doctor. |
| Have panic attacks or an anxiety disorder | Holding the breath can trigger the feeling of air hunger. Use short holds or none, and practice when calm first. |
| Have asthma, COPD or another lung condition | Ask your doctor or respiratory team which breathing exercises suit you. |
| Have a heart condition or uncontrolled blood pressure | Avoid straining during holds and ask your doctor first. Keep taking prescribed treatment. |
| Have a history of trauma | Keep your eyes open, stop whenever you like, and consider learning with a therapist. |
| Are teaching a child | Use short counts such as 2 or 3, make holds optional, and keep it playful. |
- Never practice breath holds in or under water, in the bath or while swimming. Holding your breath in water can cause a sudden blackout.
- Never practice while driving or operating machinery.
- Stop if you feel dizzy, tingly, faint or short of breath, and breathe normally.
- Get urgent medical help for chest pain, a racing or irregular heartbeat, or breathlessness that does not settle. These symptoms can have a physical cause that needs checking.
When to use box breathing
Box breathing works best as a habit you practice when calm, so it is familiar when you need it. Trying a new technique for the first time in the middle of a panic attack is much harder.
Two or three squares before a presentation, interview, exam or difficult conversation.
A one-minute reset between meetings, or after a run of emails.
Five minutes before bed as part of a routine, with gentle counts and short holds.
A short warm-up to settle attention before practice.
If you already practice yoga, box breathing fits naturally at the start or end of a session. It pairs well with shavasana, the final resting pose. New to yoga? Our introduction, what is yoga, explains how breath fits into the wider practice.
Common box breathing mistakes
- Breathing too deeply. Huge breaths can make you light-headed. Aim for a full but comfortable breath, about 70 percent of your maximum.
- Clamping the throat during holds. Keep the jaw and throat relaxed. A hold is a pause, not a seal.
- Picking a count that is too long. If you rush the next breath after a hold, the count is too long. Drop it by one.
- Lifting the shoulders. Let the belly and lower ribs expand. Shoulders that rise to your ears mean tension, not depth.
- Only trying it in a crisis. Practice daily when calm so it is ready when you need it.
- Expecting it to fix everything. It is a useful tool for moments of stress. Lasting anxiety, low mood or sleep problems deserve professional help.
Box breathing compared with other breathing techniques
| Technique | Pattern | Holds? | Evidence notes |
|---|---|---|---|
| Box breathing | Equal in, hold, out, hold | Yes, two | Similar to mindfulness in one small trial |
| Cyclic sighing | Two inhales, long exhale | No | Did best on mood in the same trial |
| Equal breathing (sama vritti) | Equal in and out | No | Falls under general slow-breathing evidence |
| NHS calm breathing | In for up to 5, out for up to 5 | No | Recommended self-help for stress |
| Cyclic hyperventilation with holds | Fast deep breaths, then long hold | Yes, long | Higher risk; never in water |
If the holds never feel comfortable, the no-hold options are a perfectly good choice. They keep the main ingredient, slower breathing, without the part that bothers some people. Many traditions pair slow breathing with a word or sound. Our mantra library explains some of the most common.
Box breathing questions people ask
How long should I do box breathing?
Five minutes is a good target. That matches the daily dose in the 2023 Stanford trial and the NHS advice for calm breathing. In a tense moment, even two or three squares, under a minute, can help you pause before reacting.
How often should I practice?
Once a day is enough to build the habit. The NHS suggests making a calming breathing exercise part of your daily routine. Regular practice matters more than long sessions.
Should I breathe through my nose or mouth?
Most teachers suggest breathing in through the nose, because it naturally slows and warms the air. The NHS method uses in through the nose and out through the mouth. Either is fine. If your nose is blocked, breathe through your mouth and keep the pace slow.
Can I do box breathing lying down?
Yes. The NHS lists lying down as an option, with arms slightly away from your sides and palms up. Bend your knees if your lower back feels tight. In later pregnancy, lie on your side instead of your back.
Does box breathing help with sleep?
The evidence does not show that. The Stanford trial found no change in sleep measures, and NCCIH says relaxation alone is not especially promising for sleep. Many people still find a few minutes of slow breathing a pleasant part of a wind-down routine. Ongoing insomnia deserves a doctor’s advice, because cognitive behavioral therapy for insomnia is the recommended first treatment.
Will box breathing stop a panic attack?
It may help some people feel steadier, especially if they have practiced it while calm. For others, holding the breath makes panic feel worse. If that happens, drop the holds and focus on a slow, long exhale. Repeated panic attacks are treatable, so please talk to a doctor or mental health professional.
Why do I feel dizzy or tingly?
You are probably breathing too deeply or too fast between holds. Over-breathing lowers carbon dioxide in the blood, which can cause light-headedness and tingling in the lips and fingers. Stop, breathe normally, and next time use smaller breaths and a shorter count. If dizziness happens often, or with chest pain, see a doctor.
Your box breathing practice for this week
Pick one daily anchor, such as after brushing your teeth in the morning. Do five minutes of box breathing at a count that feels easy, and tick it off on the log below. After seven days, notice whether you reach for it more naturally when stress builds.
Free download
Box Breathing Practice Card and 14-Day Log (PDF)
One printable page: the box diagram, the seven steps, a count chooser, who should skip the holds, safety rules and a 14-day practice log.
This article describes a breathing practice, its history and current research for educational purposes. It is not a treatment for any illness. If you have ongoing anxiety, panic attacks, a heart or lung condition, or are pregnant, please talk to a doctor or qualified healthcare professional first, and never delay or stop medical treatment because of anything you read here.
Sources
- Balban MY, Neri E, Kogon MM, et al. Brief structured respiration practices enhance mood and reduce physiological arousal. Cell Reports Medicine 2023; 4(1): 100895. pmc.ncbi.nlm.nih.gov/articles/PMC9873947
- Zaccaro A, Piarulli A, Laurino M, et al. How breath-control can change your life: a systematic review on psycho-physiological correlates of slow breathing. Frontiers in Human Neuroscience 2018; 12: 353. frontiersin.org
- National Center for Complementary and Integrative Health. Relaxation Techniques: What You Need To Know (updated June 2021). nccih.nih.gov
- NHS. Breathing exercises for stress. nhs.uk
- Divine M. Here’s a Navy SEAL trick for staying calm and focused. TIME, May 4, 2016. time.com
- Saint Luke’s Health System. Understanding Hyperventilation Syndrome. saintlukeskc.org
- Svatmarama. Hatha Yoga Pradipika (circa 15th century), chapter 2, on pranayama and kumbhaka.
