A free guided breathing timer for box breathing, 4-7-8, equal, coherent, and Wim Hof techniques. No signup, no ads — just press start.
4-4-4-4 — used by Navy SEALs and ER doctors to drop stress fast.
Tip: press Space to start/pause, Esc to reset.
Slow, paced breathing isn't a wellness fad — it's one of the best-studied non-pharmacological interventions for stress, anxiety, and sleep. Four mechanisms drive the effect:
Harvard Health classifies breath-focused practices among its top six relaxation techniques (source), and a 2018 review in Frontiers in Human Neuroscience (PMC6137615) summarizes the mechanism: slow breathing (≈6 breaths/min) shifts autonomic balance toward parasympathetic dominance, improves mood, and reduces cortisol.
| Mode | Pattern | Best for | Time to effect |
|---|---|---|---|
| Box | 4-4-4-4 | Focus under pressure | ~60s |
| 4-7-8 | 4-7-8 | Sleep, panic, anxiety | ~90s |
| Equal | 4-4 | Beginners, anytime | ~2 min |
| Coherent | 5.5-5.5 | HRV training, mood | ~3 min |
| Wim Hof | 30 power + hold ×3 | Energy, cold tolerance | ~10 min |
If you're new, start with equal breathing — it's forgiving and works anywhere. For a stress spike at work, switch to box breathing. For falling asleep, 4-7-8 is the gold standard. For a daily mood and HRV practice, coherent breathing at ~5.5 breaths per minute is the most studied "sweet spot." Save Wim Hof for energizing morning sessions only — on dry land, sitting or lying down.
Breathing exercises are generally very safe, but they are not a substitute for medical care. If you have a heart condition, epilepsy, high or low blood pressure, are pregnant, or have a history of fainting, talk to a doctor before practicing Wim Hof or any technique that involves breath retention. Never do Wim Hof in or near water, while driving, or standing up.
4-7-8 breathing is the most studied for acute anxiety because the long exhale (8 seconds) strongly stimulates the vagus nerve and shifts you into the parasympathetic 'rest and digest' state. Box breathing is a close second and feels easier to sustain. Equal breathing is the gentlest option if 4-7-8 feels intense at first.
Most people feel a noticeable drop in heart rate and tension within 60 to 90 seconds — that's roughly 6 to 10 full cycles of any slow-paced technique. For deeper effects on mood and HRV, a daily 5 to 10 minute practice over 2 to 4 weeks shows the strongest research-backed benefits.
Yes. Dr. Andrew Weil, who popularized the 4-7-8 pattern, specifically recommends it as a pre-sleep tool: 4 cycles, twice a day, with one set right before lying down. The extended exhale lowers heart rate and signals safety to the nervous system, making it easier to fall asleep.
Box breathing (4-4-4-4) is symmetrical with two equal holds — it's used by Navy SEALs and ER doctors for sustained calm focus under stress. 4-7-8 is asymmetrical with a much longer exhale and no empty hold — it's better for falling asleep or dropping out of a panic spike quickly.
Only on dry land, sitting or lying down, and never in or near water — fainting underwater has caused deaths. Skip Wim Hof if you're pregnant, have a heart condition, epilepsy, or high blood pressure, and check with a doctor first. If you feel lightheaded, stop and breathe normally.
For general stress reduction, once a day for 5 to 10 minutes is plenty. For sleep, do 4-7-8 right before bed. For panic or acute stress, you can use box breathing as needed — there's no upper limit on slow paced breathing for healthy people.
A 5-minute breath practice only works if you actually do it. HabitBox puts a one-tap streak on your home screen — log the check-in, watch the streak grow, let the cue do the work.
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