When you're stressed, you tend to breathe fast and shallow. That can make you feel even more anxious (Cleveland Clinic, 2021). Box breathing is a simple way to slow things down. It takes about 16 seconds per round, needs no equipment, and you can do it anywhere – at your desk, on the bus or in bed.
Key insight
Box breathing won't fix the cause of your stress. But it's a free, quick tool that can help you feel calmer in the moment – and the evidence for breathing exercises, while still early, is encouraging.
What is box breathing?
Box breathing means breathing in, holding, breathing out and holding again, for a slow count of four each time. The four equal steps are like the four sides of a box. It's also called square breathing, four-square breathing or 4-4-4-4 breathing. It comes from yoga breathing practice (Cleveland Clinic, 2021). You may have heard that the US Navy SEALs use it – but that tells us it's popular, not that it works.
Follow the sides of the box, counting slowly to four on each side.
How to do it
Sit or lie comfortably. If you're sitting, rest your back against the chair and put your feet flat on the floor (Medical News Today, n.d.). Then:
| Step | What to do |
|---|---|
| 1. Empty your lungs | Breathe out slowly, letting all the air out (Cleveland Clinic, 2021). |
| 2. Breathe in | Breathe in through your nose while you slowly count to four in your head. Notice the air filling your lungs and stomach (Cleveland Clinic, 2021). |
| 3. Hold | Hold your breath for a count of four (Cleveland Clinic, 2021). Try not to clamp your mouth or nose shut (Medical News Today, n.d.). |
| 4. Breathe out | Breathe out slowly for a count of four (Cleveland Clinic, 2021). |
| 5. Hold | Hold again for a count of four, then start the next round (Cleveland Clinic, 2021). |
| 6. Repeat | Do three to four rounds (Cleveland Clinic, 2021), or keep going for a few minutes until you feel calmer (Medical News Today, n.d.). |
Tips: breathe gently and never strain. If counting to four is hard, try three instead. As it gets easier, you can slowly lengthen the count (Cleveland Clinic, 2021; Medical News Today, n.d.). It also helps to practise once or twice a day when you're calm, so it comes more easily when you're stressed (Cleveland Clinic, 2021).
Follow the dot. One full round takes 16 seconds.
When to use it
| Moment | How it can help |
|---|---|
| Lying awake at night | A few rounds can give a busy mind something calm to focus on. See our guide to sleep stages. |
| Before a stressful appointment or meeting | Try three or four rounds while you wait. |
| When a feeling is building | Pause, breathe, then try naming what you feel with our feelings wheels. |
| When you're already calm | Practising once or twice a day makes it easier to use when you're stressed (Cleveland Clinic, 2021). |
Why might it help?
Your body has two main settings. When you're stressed, your "fight or flight" system is on high alert. Slow, steady breathing can help switch you into your "rest and digest" system instead, which calms your body down. Silently counting also gives your mind something to focus on, a bit like a simple meditation (Cleveland Clinic, 2021).
What does the research say?
| What we know | What the evidence shows |
|---|---|
| Breathing exercises can reduce stress | A 2023 review from the University of Sussex pooled 12 trials with 785 adults. People who did breathing exercises reported less stress than those who didn't. Most studies had some risk of bias, and the review looked at breathing exercises in general, not box breathing on its own (Fincham et al., 2023). |
| Box breathing may lift mood | In a month-long trial, people did five minutes a day of box breathing, another breathing exercise or mindfulness meditation. All groups felt better and less anxious (Balban et al., 2023). But the trial was run online with generally healthy volunteers (ClinicalTrials.gov, 2022), so researchers had less control over how people did the exercises. |
| It isn't proven to be the best method | In the same trial, an exercise with a long, slow breath out improved mood the most (Balban et al., 2023). But a small follow-up study of that exercise, not yet peer-reviewed, didn't find the same mood boost (Boucher and Dixon, 2024). Pick the method you find easiest to stick with. |
| It isn't a treatment on its own | If anxiety is affecting your daily life, talking therapies can help (NHS, n.d.b). Breathing exercises work best alongside support like this, not instead of it. |
Other breathing exercises to try
If holding your breath feels uncomfortable, you don't have to. The NHS breathing exercise for stress skips the holds. Breathe in through your nose and out through your mouth, gently and regularly, counting from 1 to 5 each way if it helps. Keep going for at least 5 minutes (NHS, 2026). You could also try making your out-breath longer than your in-breath, which did especially well in the mood trial (Balban et al., 2023).
Box breathing and panic attacks
Panic attacks feel frightening, but they aren't dangerous and usually last 5 to 20 minutes. Mental health charity Rethink suggests riding it out, reminding yourself it will pass, and breathing deeply in and slowly out. It also suggests a version of box breathing with a longer out-breath: in for 4, hold for 4, out for 6, hold for 2 (Rethink Mental Illness, n.d.). If you're breathing too fast, an NHS leaflet uses a similar pattern – in for 4, hold for 4, out for 4 – but warns not to take too many deep breaths in a row, or you may feel dizzy (NHS Fife, n.d.).
If it's your first panic attack, or you're not sure it's panic, get medical help – see the chest pain advice below.
Box breathing for children
Children can draw the box instead of imagining it. They trace a square on paper, on a picture or in the air with a finger, breathing in up one side, holding along the top, breathing out down the other side and holding along the bottom. It can help to have a trusted adult talk them through it, and to practise when they're calm (Pembrokeshire County Council, n.d.). If four seconds feels too long, count to three instead (Medical News Today, n.d.).
Staying safe
| If… | Do this |
|---|---|
| You feel dizzy or light-headed | This can happen when you start. Stop, breathe normally, and try sitting or lying down next time (Sherwood Forest Hospitals NHS Foundation Trust, n.d.). |
| You have a breathing condition | Focusing on your breath may feel uncomfortable. Grounding exercises may suit you better (Sherwood Forest Hospitals NHS Foundation Trust, n.d.). If you have a heart or lung condition, or you're pregnant, it's sensible to check with your GP or care team before holding your breath. |
| You're short of breath for no clear reason, or have chest pain | Don't assume it's stress. Call 999 if you have sudden chest pain that doesn't go away, pain that spreads to your arm, neck, jaw, stomach or back, or chest pain with sweating, feeling sick, light-headedness or shortness of breath (NHS, n.d.a). |
Getting more help
If stress or anxiety is affecting your daily life, talk to your GP. You may also be able to get help directly:
| Where you live | Help you can get yourself |
|---|---|
| England | Refer yourself to NHS Talking Therapies if you're 18 or over (16 or 17 in some areas), without a diagnosis (NHS, n.d.b). |
| Wales | Anyone over 16 can sign up for free online CBT (SilverCloud) without seeing a GP (Betsi Cadwaladr University Health Board, 2025). |
| Scotland | Call Breathing Space free on 0800 83 85 87 if you're over 16 and feeling low or anxious. It's open Monday to Thursday, 6pm to 2am, and from 6pm Friday to 6am Monday (Breathing Space, n.d.). |
| Northern Ireland | Call Lifeline free on 0808 808 8000, 24 hours a day, if you're feeling anxious or in distress (nidirect, n.d.). |
| Anywhere in the UK | Samaritans is free to call on 116 123, day or night (Samaritans, n.d.). |
More from Zero Jargon Health
Try our feelings wheels, and read our posts on anxiety, NHS Talking Therapies and sleep problems.
The bottom line
Box breathing is simple: in for four, hold for four, out for four, hold for four. It's free, it takes seconds, and research suggests breathing exercises can take the edge off stress. Just breathe gently, stop if you feel dizzy, and use it alongside – not instead of – other support if you need it.
References
Balban, M.Y., Neri, E., Kogon, M.M., Weed, L., Nouriani, B., Jo, B., Holl, G., Zeitzer, J.M., Spiegel, D. and Huberman, A.D. (2023) 'Brief structured respiration practices enhance mood and reduce physiological arousal', Cell Reports Medicine, 4(1), 100895. Available at: https://doi.org/10.1016/j.xcrm.2022.100895 (Accessed: 29 September 2026).
Betsi Cadwaladr University Health Board (2025) 41k referrals milestone for NHS Wales' digital mental health service. 12 November. Available at: https://bcuhb.nhs.wales/news/2025/41k-referrals-milestone-for-nhs-wales-digital-mental-health-service/ (Accessed: 29 September 2026).
Boucher, I. and Dixon, M.J. (2024) The effects of cyclic sighing on heart rate variability, resting breathing rate, and mood [Conference poster]. University of Waterloo Psychology Discovery Conference. Available at: https://uwaterloo.ca/psychology-discovery-conference/sites/default/files/uploads/documents/boucher_pdc_2024.pdf (Accessed: 29 September 2026).
Breathing Space (n.d.) Need help now? Call free on 0800 83 85 87. Available at: https://breathingspace.scot/ (Accessed: 29 September 2026).
Cleveland Clinic (2021) How box breathing can help you destress. 17 August. Available at: https://health.clevelandclinic.org/box-breathing-benefits (Accessed: 29 September 2026).
ClinicalTrials.gov (2022) Psychophysiological effects of controlled respiration and mindfulness (NCT05304000). Available at: https://clinicaltrials.gov/study/NCT05304000 (Accessed: 29 September 2026).
Fincham, G.W., Strauss, C., Montero-Marin, J. and Cavanagh, K. (2023) 'Effect of breathwork on stress and mental health: a meta-analysis of randomised-controlled trials', Scientific Reports, 13, 432. Available at: https://doi.org/10.1038/s41598-022-27247-y (Accessed: 29 September 2026).
Medical News Today (n.d.) Box breathing: how to do it and benefits. Available at: https://www.medicalnewstoday.com/articles/321805 (Accessed: 29 September 2026).
NHS (2026) Breathing exercises for stress. Last reviewed 12 June. Available at: https://www.nhs.uk/mental-health/self-help/guides-tools-and-activities/breathing-exercises-for-stress/ (Accessed: 29 September 2026).
NHS (n.d.a) Chest pain. Available at: https://www.nhs.uk/conditions/chest-pain/ (Accessed: 29 September 2026).
NHS (n.d.b) Find NHS talking therapies for anxiety and depression. Available at: https://www.nhs.uk/service-search/mental-health/find-an-nhs-talking-therapies-service (Accessed: 29 September 2026).
NHS Fife (n.d.) Hyperventilation [Leaflet]. Available at: https://www.nhsfife.org/media/34651/hyperventillationmoodcafe.doc (Accessed: 29 September 2026).
nidirect (n.d.) Lifeline freephone helpline. Available at: https://www.nidirect.gov.uk/contacts/lifeline (Accessed: 29 September 2026).
Pembrokeshire County Council (n.d.) Emotionally-based school avoidance: calming strategies. Available at: https://www.pembrokeshire.gov.uk/emotionally-based-school-avoidance/calming-strategies (Accessed: 29 September 2026).
Rethink Mental Illness (n.d.) How do I manage a panic attack?. Available at: https://rethink.org/advice-and-information/get-help-now/self-help-guides-for-urgent-help/how-do-i-manage-a-panic-attack/ (Accessed: 29 September 2026).
Samaritans (n.d.) Contact us. Available at: https://www.samaritans.org/how-we-can-help/contact-samaritan/ (Accessed: 29 September 2026).
Sherwood Forest Hospitals NHS Foundation Trust (n.d.) Breathing exercises [Leaflet]. Available at: https://sfh-tr.nhs.uk/media/o3fpizwx/breathing-exercises-leaflet.pdf (Accessed: 29 September 2026).
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Important medical disclaimer
The content provided in this blog post is for educational and informational purposes only and does not constitute professional medical advice, diagnosis, or treatment. Always seek the advice of your GP, psychiatrist or another qualified health provider with any questions you may have regarding a medical condition. Never disregard professional medical advice or delay in seeking it because of something you have read on this website. Never start, stop or change a prescribed medicine without speaking to your prescriber first.
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