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Breathe along · Focus

Box breathing timer: breathe along online

Breathe in for 4, hold for 4, breathe out for 4, hold for 4. The orb breathes, you follow. Free, no sign-up, no cookies.

Ready?

First, breathe out once, calmly

in 4 · hold 4 · out 4 · hold 4

If anything feels uncomfortable, just stop and breathe normally.

How it works

  1. Sit up straight with your feet flat on the floor, and breathe out once, calmly.
  2. Breathe in through your nose while the dot travels up the left side: 4 seconds.
  3. Hold your breath loosely while the dot moves across the top: 4 seconds.
  4. Breathe out slowly while the dot travels down the right side: 4 seconds.
  5. Hold with your lungs empty, no straining, while the dot moves back along the bottom: 4 seconds.

That’s one round, and it takes 16 seconds. Five minutes is plenty to start. Then just breathe normally.

Only hold your breath as long as it feels easy, never until you’re gasping for air. Never practice breath holds in or near water (including the bathtub), while driving, or anywhere a brief blackout could be dangerous. If you feel dizzy or notice tingling in your hands or lips, stop and breathe normally. Some people feel their heartbeat more clearly while holding their breath. If the pounding keeps up, or comes with shortness of breath or dizziness, stop and get it checked by a doctor. If you’re pregnant or have a heart or circulation condition, high blood pressure, epilepsy, glaucoma, or panic disorder, skip the holds or check with your doctor first.

If the holds feel hard

If you get dizzy or find yourself gasping, the box is too big: stop and breathe normally. Right after hard exercise, box breathing is a worse fit: in one study, it felt much harder than calm breathing without holds.1 If counting and holding stress you out, pick an exercise without holds, like the physiological sigh or coherent breathing.

Nose or mouth?

There’s no fixed rule. Mark Divine, who popularized box breathing, describes breathing in and out through the nose, and a Stanford study asked people to breathe through the nose if possible.2, 3 If your nose is blocked, your mouth works too.

What studies show

For something so popular, box breathing has barely been studied. A 2026 systematic review found only a handful of randomized trials, with mixed results.4 In the Stanford study, 21 healthy adults did five minutes of box breathing a day for a month. After each session, they were less tense and in a better mood, but only cyclic sighing lifted mood more than meditation did.3 In 47 university students who did one minute in tense moments of daily life, tension was lower than with no exercise, about the same as with sighing.5 In 43 resident physicians who practiced daily for four weeks, stress barely went down on average. Seven clearly benefited; for some, stress even went up slightly.6 These studies tested the technique, not the nowa app.

The bottom line: in the moment, box breathing works about as well as other calm breathing exercises, but it isn’t special. Its biggest advantage is that it’s easy to remember. More on this, including how much of the Navy SEAL story holds up: Box breathing: how to do it, and what the research says.

This page shares general information about breathing exercises for relaxation and well-being. It is not medical advice and does not replace diagnosis or treatment by a licensed professional. nowa is a wellness app. It is not a medical device and is not intended to diagnose, treat, cure, or prevent any disease. Only practice while it feels comfortable. If you feel dizzy or short of breath, or notice a racing heart, chest pain, or strong anxiety, stop and breathe normally. If you have a medical condition (for example a heart or lung condition, or epilepsy) or are pregnant, talk to your doctor or midwife before trying new breathing exercises. Never change prescribed treatment on your own.

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Sources

  1. Kasap M, Aydin GR (2025). Box breathing or six breaths per minute: Which strategy improves athletes post-HIIT cardiovascular recovery? PLoS One 20(11):e0336615. doi.org/10.1371/journal.pone.0336615
    Randomized crossover study, 40 active college students
  2. Divine M (2016). The breathing technique a Navy SEAL uses to stay calm and focused. TIME, May 4, 2016. Adapted from his book Kokoro Yoga. time.com/4316151
    Essay by the person who named it, not a study
  3. Balban MY, Neri E, Kogon MM, Weed L, Nouriani B, Jo B, Holl G, Zeitzer JM, Spiegel D, Huberman AD (2023). Brief structured respiration practices enhance mood and reduce physiological arousal. Cell Reports Medicine 4(1):100895. doi.org/10.1016/j.xcrm.2022.100895
    Randomized study, remote, 108 healthy adults, one month
  4. Dujawara A, Ali K, Kumari S (2026). Systematic review of randomised controlled trials evaluating box breathing for stress, autonomic, and clinical outcomes. Applied Psychophysiology and Biofeedback, online ahead of print. doi.org/10.1007/s10484-026-09812-7
    Systematic review
  5. Riedl EM, Bracklo T, Wimmer K, Perzl J, Gdynia HJ, Thomas J, Surzykiewicz J (2026). Simply breathing anxiety away? A pilot, just-in-time ecological momentary intervention study of one-minute cyclic sighing versus box breathing as tools for acute anxiety reduction and attention promotion in real life. Anxiety, Stress, & Coping 39(5):608–622. doi.org/10.1080/10615806.2026.2659809
    Preregistered real-life pilot study, 47 university students
  6. Vetter VM, Kurth T, Konigorski S (2026). Evaluation of two easy-to-implement digital breathing interventions in the context of daily stress levels in a series of N-of-1 trials: results from the Anti-Stress Intervention Among Physicians (ASIP) study. npj Digital Medicine 9(1):135. doi.org/10.1038/s41746-025-02317-3
    Series of single-person trials, 76 resident physicians, four weeks

All sources last checked on November 3, 2026.