Six essays on the mechanics of breath, the practices that survive scrutiny, and the claims that do not. Written for people who would rather understand the physiology than follow a protocol.
Inhale four, hold seven, exhale eight. Stop whenever it stops feeling easy.
The nose filters, warms and humidifies. The mouth is a bypass, useful for speech and sprinting, not for the other twenty-three hours.
Breathing more is rarely the fix. Breathing less, more slowly, is closer to it — and much harder to sell.
Every claim carries a source and a confidence level. Where the data runs out, we say so in the same paragraph.
Each piece carries its evidence grade, cites its sources, and says plainly where the data runs out.
Lead essay
The mouth is a bypass. The nose is the system. What happens to filtration, nitric oxide and sleep when you switch back — and what the research can actually support.
Read the essayMost people chase a bigger inhale. The useful signal is how long you can wait before the next one.
Chest breathing is not a moral failure. It is what happens when a muscle is asked to work at the wrong length, all day.
A cheap intervention with a devoted following. What it can plausibly do, what it cannot, and who should never try it.
Heart rate variability rises. That is not the same as anxiety falling. Reading the evidence without the marketing.
Hyperventilation, panic, pregnancy, epilepsy, low blood pressure: the cases where a breathing exercise can make things worse.
Six essays, updated as the evidence changes. How we grade evidence
Not a programme. Three patterns that cover most of what breathwork is actually good for, with an honest note on each.
5.5 s in · 5.5 s out
The rate at which the cardiovascular and respiratory rhythms tend to align. If you learn one pattern, learn this one. Five minutes, seated, nose only.
What the trials show4 · 4 · 4 · 4
Equal inhale, hold, exhale, hold. Useful when attention is scattered. Skip the holds if you have panic disorder or find them agitating.
On breath holds4 · 7 · 8
A long exhale for the end of the day. It is a wind-down cue, not a sleep treatment, and it is the pattern running in the pacer above.
Sleep and the mouth
Health writing has a low bar and a high noise floor. These are the three rules that keep us on the right side of it.
If a practice cannot be explained in physiological terms, it does not go in. "It works because it works" is not an explanation.
Randomised trials, cohort studies, mechanistic work and expert opinion are not interchangeable. Each essay states which it is relying on.
Every piece has a paragraph on what the evidence cannot tell you. It is usually the most useful paragraph in the article.