Solid human studies, with some room left for argument.
Five minutes a day of double inhale through the nose, then a long, slow exhale. In a randomised trial it came out ahead of five minutes of mindfulness meditation on day-to-day mood.
Most breathing techniques are handed down rather than tested. This one was tested against a credible comparator, which is why it is in the library and most are not.
How to do it
- Inhale through the nose.
- On top of that breath, take a second, shorter sip of air through the nose.
- Let it out through the mouth, slowly, for longer than both inhales together.
- Repeat for five minutes.
There is no count to hit and no app to open. If the second sip does not happen easily, the lungs were already full — that is the signal to just exhale.
Which part is doing the work
The long exhale. The second inhale exists to make a longer exhale possible, not because two inhales are themselves the mechanism. This matters practically: if you get the double inhale wrong but the exhale is slow and complete, you are still doing the exercise.
The trial
A randomised trial pitted five daily minutes of breathwork against five daily minutes of mindfulness meditation. Cyclic sighing came out ahead on day-to-day mood and produced the larger drop in resting breathing rate.
We rate it B rather than A because that is one good study, not a settled literature — the comparison is well built and the finding has not yet been replicated at the scale an A requires. It is a strong result, honestly labelled.
What it is not
A treatment. It is a steadying tool with a good study behind it, and it does not substitute for care if anxiety or low mood is affecting your life. In IntentNorth it sits alongside the other five-minute tools, free, permanently — we do not charge for anything someone reaches for at their worst. The full library shows what else is rated B and what is not.
Before you try it
A steadying tool, not treatment. Stop if you feel light-headed, and skip it entirely in water or behind the wheel. If you are pregnant or have a heart or breathing condition, check with your doctor before making it a daily habit.
IntentNorth is an iPhone app that puts practices like this one into your actual week — at real times, around what you already have on, with the grade on each one. It changes the week when your week changes.
How this is graded. Every practice in IntentNorth carries a letter from A to E for the strength of the research behind it, shown on the practice itself rather than in a footnote. All 204 are published, and 122 of them are rated C or weaker. Read the whole library.
Educational information, not medical advice. Nothing here is a diagnosis or a personal recommendation, and none of it replaces a conversation with your doctor or pharmacist.
Last reviewed September 2026