How to breathe while running: a rhythm for every effort

Should you match your breathing to your steps?

You probably already do: most runners fall into a breathing rhythm locked to their steps, called locomotor–respiratory coupling. Choosing the pattern on purpose gives you a steady rhythm to return to when breathing turns ragged, and a simple way to keep easy days easy. It is a tool, not a rule.

In the classic account by Bramble and Carrier (1983), four-legged mammals lock one breath to each stride, while human runners use several locked patterns, from four strides per breath down to one, plus odd ratios such as 5:2 and 3:2, and appeared to favor 2:1: two strides, or four steps, per breath. A stride is two steps, so "3:2" in a running magazine usually means steps, not strides.

Daley, Bramble and Carrier (2013) measured airflow in 14 runners and found each footfall pushes air in or out on its own. Runners tended to time their breathing transitions to the steps that helped rather than fought them, and sometimes did not couple at all. Training does not seem to tighten the lock: McDermott and colleagues (2003) found experienced runners simply held their preferred couplings more stably as speed changed.

What is the best breathing pattern for running?

There is no single best pattern, but a practical ladder uses fewer steps per breath as the effort rises: three steps in and three out at Easy, three in and two out at Steady, two in and one out at Hard. Each sits inside the range of couplings runners use naturally. If one feels forced, shift to its neighbor.

With five or three steps per breath, each exhale starts on the opposite foot from the last; with six or four, always the same foot. Some coaches prefer odd patterns so neither side always starts the exhale: plausible, not tested, so a preference.

At truly hard efforts, many runners breathe faster than any neat pattern allows, or lose the lock entirely, which is normal. The ladder earns its keep at Easy and Steady, and as a reset: when a Steady stretch turns ragged, shorten the step for a few strides and find three in, two out again.

Should you breathe through your nose when running?

On easy runs, nose breathing is a good check: if you cannot keep it up comfortably, you are probably running faster than Easy. At harder efforts its smaller airway caps how much air you can move, so most people open the mouth. That is physiology, not a lack of discipline.

The best-known running study here is small. Dallam and colleagues (2018) tested 10 recreational runners who had breathed only through the nose for at least six months, once nasally and once orally: a single comparison, not a training trial.

Read it both ways. Nose-breathing, these runners lasted about as long with fewer breaths and less air, and at a submaximal speed their oxygen cost was slightly lower. Their VO2 max (the most oxygen the body can use) was also about 7% lower nasally, not statistically significant in a sample this small. And they had practiced for years. A review by Harbour and colleagues (2022) concludes that the smaller airway limits higher intensities, that practiced nasal breathers may sustain it at quite high efforts, and that direct experimental evidence is limited.

When should you switch to mouth breathing?

Switch when the nose stops being enough. In lab studies, most people move from nose to nose-and-mouth breathing once they move roughly 35 to 40 liters of air a minute, and for Steady and Hard running, breathing through the mouth, or both, is normal and expected.

Niinimaa and colleagues (1981) found 20 of 30 adults switched to oronasal breathing at a ventilation of about 35 liters a minute; five stayed nasal throughout and four habitually breathed through both. Saibene and colleagues (1978) put the highest nasal-only ventilation at around 40 liters a minute and suggested psychological factors also influence the switch. The point varies by person; a blocked nose, allergies or a cold all lower it.

If you are breathless far out of proportion to the effort, wheezing, or can't recover your breath, that is not a technique problem. Harbour's review notes exercise-induced breathlessness is common among runners. Talk to a doctor, and see our health disclaimer for what this journal can and cannot tell you.

How should you breathe when running uphill?

On a climb, keep the effort and let the breathing pattern shorten with it. Running cost rises steeply with gradient, so breathing wants to quicken. Shorten your step first, then drop to the next pattern, Steady's three-two or Hard's two-one, rather than forcing a flat-ground rhythm up the hill.

On a long climb in an easy run, a rhythm collapsed to two-one means the effort has gone well past Easy: slow down or walk until three-two returns. On a short hill, settle your breathing before it, crest at the same effort, and let the rhythm lengthen on the way down. How to run hills has the energy-cost numbers.

Does belly breathing or a long exhale help when running?

Possibly, mainly as a way to settle. Slow, deep breathing and a long exhale are widely taught, and they may help you feel calm and in control, especially early on or in a recovery. Evidence that any breathing technique directly improves running performance is thin, so read bigger claims with care.

Harbour and colleagues are plain: breathing strategies probably do not improve performance in the moment, may help by 1 to 5% over a longer learning period, and their greatest benefits are likely psychological. Still worth having. A deliberate rhythm gives your attention somewhere to go when a run hurts, and a loose jaw, low shoulders and a full exhale cost nothing.

How does Gears coach breathing?

Gears gives breathing a voice and, on iPhone, a sound. The coach's breathing cues come on a timer, matched to your gear: nose at Easy, a step rhythm at Steady, short and even at Hard. They teach, never claim to hear you, and turn off in Settings.

On iPhone, the breathing rhythm and cadence metronome adds a breathing sound: a recorded breath in and out, laid on your steps and patterned by gear. The defaults are the ladder above, with Hard's two in, one out for hard racing, hills and the finishing push; each gear can be set to 2:2, 3:2, 2:3, 3:3 or 2:1. The sound mixes under your music without dipping it, drops under the coach, and has its own volume on the run screen.

Honest limits: the sound is iPhone-only for now; on Apple Watch, only the coach's lines speak. Gears neither measures your breathing rate nor judges your technique. It gives you a rhythm to hold, at the effort of your personalized running zones.