- This page's pacer lets you set your own seconds for inhale, hold, exhale and hold; the five named technique pages below open already set to that technique's count.
- A 2023 randomised trial at Stanford compared three of these techniques directly: box breathing, the physiological sigh and a fast-breathing-with-hold pattern, against mindfulness meditation, in 108 adults over 5 weeks. All four improved mood; cyclic sighing (the physiological sigh) improved it the most.
- 4-7-8 breathing has no dedicated trial of its own; coherent breathing and the Wim Hof method each have their own separate line of research, described on their own pages.
- The physiological sigh needs no counting and gives most people a noticeable effect within a single day; the others work better as a practice repeated daily over weeks.
- The Wim Hof method's fast-breathing phase carries a specific fainting risk from lowered blood carbon dioxide and should never be practised in or near water.
- None of these techniques treats a diagnosed anxiety, respiratory or heart condition; they are a real, evidence-based complement to medical care, not a replacement for it.
Which breathing technique should you use?
The honest answer depends on what you need right now. For a fast, one-off reset with no counting, the physiological sigh has the strongest single piece of evidence behind it. For a quick, structured reset before a specific stressful moment, box breathing is easy to count and remember. For falling asleep, 4-7-8 breathing's long exhale is built for that specific moment. For energy and alertness rather than calm, the Wim Hof method's fast breathing fits that goal, with real safety rules to follow. For an ongoing daily habit rather than an emergency tool, coherent breathing at about 5.5 breaths a minute is the simplest to sustain.
The five breathing techniques, compared
Each technique below links to its own page with full instructions, the research behind it and its own FAQ.
| Technique | Pattern | Best for | Evidence |
|---|---|---|---|
| Box breathing | 4 s in, 4 s hold, 4 s out, 4 s hold | A quick, structured reset | 2023 Stanford randomised trial (one arm) |
| 4-7-8 breathing | 4 s in, 7 s hold, 8 s out | Falling asleep | No dedicated trial; related slow-breathing evidence only |
| Physiological sigh | Two inhales, then one long exhale | Fast relief, same day | 2023 Stanford randomised trial (largest effect of the four groups) |
| Wim Hof breathing | 30 fast breaths, a hold, a recovery hold, 3 rounds | Energy, alertness | 2014 Radboud study (combined with cold exposure); 2023 Stanford trial (breathing alone, smaller effect) |
| Coherent breathing | About 5.5 s in, 5.5 s out, no holds | A daily habit | Heart-rate-variability biofeedback research since 2000 |
What the 2023 Stanford trial found, comparing three techniques directly
A randomised controlled trial at Stanford University is the clearest side-by-side comparison available. 108 adults were split into four groups and practised 5 minutes a day for 5 weeks: one did box breathing, one did the physiological sigh (called cyclic sighing in the study), one did a fast-breathing pattern with a breath-hold in the same family as the Wim Hof method, and one practised mindfulness meditation with no set breathing pattern, used as the comparison group.
All four groups improved mood and reduced anxiety over the 5 weeks compared with their own starting point. The physiological sigh produced the largest improvement in positive mood and the largest drop in resting respiratory rate of the four, and its advantage over the others grew across the 5 weeks. Mindfulness meditation produced the largest reduction in negative mood specifically, a different measure. This one trial is the strongest single piece of evidence behind three of the five techniques on this page.
Why do these five rhythms affect the body differently?
These five techniques do not differ in effect because one is simply “better” than another. They differ because they work through different mechanisms in the body. Four of the five slow the breath down and calm the body; the fifth, the Wim Hof method's fast breathing, works in the opposite direction.
Box breathing and coherent breathing work through essentially the same mechanism: both slow the breathing rate toward roughly 4 to 6 breaths a minute, the range where heart rate variability and parasympathetic, calming nervous system activity rise the most in the reviewed research. Coherent breathing applies that pace most directly, with no holds; box breathing adds two 4-second pauses that slow the overall rhythm further, but those holds have no separate mechanism of their own beyond the slower pace.
The working part of 4-7-8 breathing is its long exhale: 8 seconds, longer than either the inhale or the hold, following the same extended-exhale principle as slow breathing in general. The specific 4-7-8 ratio has no dedicated study of its own, but the extended-exhale mechanism behind it is the same one at work in box breathing and coherent breathing.
The physiological sigh works two ways at once: the second, short top-up inhale reinflates alveoli that gradually collapse during ordinary breathing, and the long exhale that follows it uses the same slow-exhale mechanism as the other techniques here. In the 2023 Stanford trial, this double effect produced the largest drop in resting respiratory rate of the four techniques compared.
The Wim Hof method's fast breathing works in the opposite direction: deliberate hyperventilation lowers blood carbon dioxide, which the 2014 Radboud study linked to a rise in blood adrenaline and a changed immune-signalling response. This is a body-activating mechanism, not a calming one, which is why this rhythm differs from the other four and suits energy rather than calm.
How to use the timer above to set your own rhythm
The timer above starts set to box breathing: 4 seconds for the inhale, the hold, the exhale and the second hold. Each of the four values can be changed independently with its own slider, and setting a value to zero skips that phase entirely.
The same timer can be set to any of the five named techniques below without opening another page: for 4-7-8 breathing, set a 4-second inhale, a 7-second hold, an 8-second exhale and a 0-second second hold; for coherent breathing, set roughly 5 to 6 seconds for the inhale and the same for the exhale, and lower both holds to zero.
A soft chime marks the start of each phase, so there is no need to watch the screen and count seconds; an optional session timer stops the session automatically after the chosen number of minutes.
Is breathing practice safe for everyone?
Breathing exercises are generally safe for healthy adults practised as described on these pages. Stop and breathe normally if you feel dizzy or short of breath, which is common when starting and normally passes within a few breaths.
The Wim Hof method's fast-breathing and hold phases carry the clearest specific risk, fainting from lowered blood carbon dioxide, and should never be practised in or near water, while driving, or standing up quickly afterwards. Anyone pregnant, or with epilepsy, a heart condition, or high or low blood pressure, should talk to a doctor before making any breath-holding practice a regular habit.
Questions people ask
Which breathing technique works fastest?
The physiological sigh needs no counting and, in a 2023 Stanford trial, produced the largest mood improvement of four techniques compared, with most people noticing an effect within a single day.
Which breathing technique is best for sleep?
4-7-8 breathing's long exhale is specifically built for winding down before sleep, though no dedicated trial has tested the 4-7-8 ratio itself.
Which breathing technique is best for anxiety?
Box breathing and the physiological sigh were both tested for mood and anxiety in the same 2023 Stanford trial; the physiological sigh produced the larger effect of the two.
Is any breathing technique dangerous?
The Wim Hof method's fast-breathing and hold phases carry a real risk of light-headedness and fainting from lowered blood carbon dioxide, and should never be practised in or near water.
Can I set my own breathing rhythm instead of a named technique?
Yes. The pacer on this page lets you set your own seconds for inhale, hold, exhale and hold; a hold set to zero is simply skipped.
Do I need headphones for the breathing timer?
No. The chime plays through your device's speaker, and the visual pacer works with the sound off.
How is coherent breathing different from the others?
It has no holds at all: just an even, slow inhale and exhale, close to a personal resonance frequency studied in heart-rate-variability research. It suits an ongoing daily habit rather than a quick fix.
Can breathing techniques replace medical treatment?
No. They are a real, evidence-based complement to medical care for everyday stress and mood, not a treatment for a diagnosed anxiety, respiratory or heart condition.
- Balban M. Y., Neri E., Kogon M. M., Weed L., Nouriani B., Jo B., Holl G., Zeitzer J. M., Spiegel D., Huberman A. D. Brief structured respiration practices enhance mood and reduce physiological arousal. Cell Reports Medicine, 2023, 4 (1), 100895.
- Kox M., van Eijk L. T., Zwaag J., van den Wildenberg J., Sweep F. C., van der Hoeven J. G., Pickkers P. Voluntary activation of the sympathetic nervous system and attenuation of the innate immune response in humans. PNAS, 2014, 111 (20), 7379–7384.
- Lehrer P., Kaur K., Sharma A., Shah A., Huseby R., Bhavsar J., Zhang Y. Heart rate variability biofeedback improves emotional and physical health and performance: a systematic review and meta-analysis. Applied Psychophysiology and Biofeedback, 2020, 45, 109–129.
- Russo M. A., Santarelli D. M., O'Rourke D. The physiological effects of slow breathing in the healthy human. Breathe, 2017, 13 (4), 298–309.
The pacer above starts at 4 seconds in, 4 seconds hold, 4 seconds out, 4 seconds hold; every value can be changed with the sliders, a hold set to zero is skipped, and an optional timer stops the session automatically.