Box breathing timer
Breathe in for 4, hold for 4, out for 4, hold for 4. Press Start and follow the sphere.
4 in, 4 hold, 4 out, 4 hold
How well it's tested: weak. One small arm, 21 people, of the same 108-person trial. Mood rose, but not clearly more than with meditation. Source
Lightheaded on the holds? Make them shorter, or switch to six a minute.
What your session means, and what to do next
The timer ends by asking how you feel next to before you started.
- Calmer and steadier. That's the effect box breathing has in the moment. In a 2026 Texas study of 66 adults, five minutes of it before a speech to judges kept heart rate, anxiety and a saliva stress marker from rising. Keep it for hard moments, like a call, a talk or a game.
- About the same. One session often feels like nothing much. Give it four weeks, rating your mood before and after each time. For a daily practice we'd pick cyclic sighing, which beat meditation on mood in the trial where box didn't.
- Lightheaded, tingly or tense on the holds. Breathe smaller, count threes in your head instead of fours, or switch the timer to six a minute, which is still slow and has no holds. Stop and breathe normally if you feel dizzy.
- Out of breath after a workout. Let your breathing settle first. After hard intervals, box kept heart rate higher than six a minute did, and people found it harder.
How box breathing works
Each side of the box is four seconds, so one breath takes 16 seconds and you breathe 3.75 times a minute. A resting adult takes 12 to 18 breaths a minute, according to Cleveland Clinic, so box slows you to about a quarter of that. Five minutes is about 19 boxes.
The count came out of police training in the 1980s, and a retired Navy SEAL commander, Mark Divine, gave it its name. It gives your mind a job, which is why people like it under pressure. In the Stanford trial, 21 adults did five minutes a day of box breathing for a month. Their mood rose after each session, but not clearly more than the meditation group's.
Do it sitting down, never in or near water and never while driving. Box breathing has the history and every trial, and box breathing or 4-7-8 compares it with the bedtime count.
5 sources
- Balban and others, Cell Reports Medicine, 2023pmc.ncbi.nlm.nih.gov
- Ryan, Box Breathing, Police Magazine, 2017-01-04policemag.com
- McAllister, Martaindale, Sutton and Andersen, Box breathing and prolonged exhalation reduces markers of physiological stress reactivity in response to a virtual Trier social stress test, Comprehensive Psychoneuroendocrinology, 2026pmc.ncbi.nlm.nih.gov
- Kasap and Aydin, Box breathing or six breaths per minute: which strategy improves athletes post-HIIT cardiovascular recovery?, PLOS One, 2025pmc.ncbi.nlm.nih.gov
- Cleveland Clinic, vital signsmy.clevelandclinic.org
