Four seconds in, six seconds out. Nothing held, nothing counted. Every part of that was a decision, and each one has a reason.
One breath is ten seconds. Six of them fill a minute.
Around six breaths a minute — 0.1 Hz — breathing falls into step with a slow wave the cardiovascular system already runs on, the one that governs blood pressure. The two line up, heart rate variability rises sharply, and the effect has a name: resonance. Practitioners call the practice resonance breathing, or coherent breathing.
The rate that suits any particular person varies, roughly between four and a half and seven breaths a minute. Six sits in the middle of that range and lands exactly on the frequency the research is built around. Ten seconds also divides a minute evenly, which is a convenience rather than a reason.
This is the one part of paced breathing the evidence is clear about. The rest of what follows is reasoning, and it is worth knowing which is which.
The mechanism is real enough: breathing in speeds the heart slightly, breathing out slows it, so a longer out-breath spends more of each cycle on the settling half.
Whether that measurably matters is less settled than it is usually made to sound. One study at six breaths a minute found longer exhalations produced higher vagally-mediated heart rate variability. A later study designed to test exactly that question compared an even ratio against a doubled out-breath at the same rate and found no difference at all, and suggested an even ratio was fine.
So four and six stays, because a slightly longer out-breath is comfortable, costs no effort, and is what most people do anyway when they slow down. Not because it is doing the heavy lifting. The rate is doing that.
Plenty of patterns hold the breath — box breathing, 4-7-8. Those are built for other purposes: focus, or falling asleep after practice. Holding a full chest raises pressure inside it and reads to the body as effort, and for anyone already anxious it can tip into the feeling of not getting enough air, which is precisely the sensation they came here to get away from.
An earlier version of this page rested two seconds on empty instead, which avoids that problem but creates a smaller one. A beat that is neither in nor out has to be explained, and a page someone opens for sixty seconds cannot afford an explanation. Two states, two words, nothing to interpret.
The curve the screen follows already flattens as it reaches the bottom, so the turn from out to in arrives as a seam rather than a bounce. The pause you feel there is the one your body makes on its own.
The cycle is anchored to a fixed point in time rather than to the moment you arrived. Open the page in Lisbon and in Osaka and both screens are at the same place in the same breath, without either one asking a server what to do.
That is what the number on the front page counts: not visits, but people who are breathing this breath, right now, with you.
Breathe →