How should you breathe when running? Mostly, let it happen

How should you breathe when running? Through your mouth and nose together, relaxed, as deeply as feels natural, and at whatever rhythm your pace asks for. That's it. Your body has been breathing without instructions for your entire life, and it doesn't suddenly need a 4-2-4 counting system the moment you put on running shoes.

Most "breathing problems" on a run are actually pacing problems. If you're gasping on an easy run, the run isn't easy. Slow down and your breathing fixes itself. The rest of this post covers the few techniques that genuinely help, the ones that are mostly folklore, what to do about side stitches and breathlessness, and how to breathe when running with asthma (short version: that's your doctor's call before it's a coach's). If you'd rather have the pacing handled for you, a running app that also plans your strength work can keep easy days easy.

How should you breathe when running: the short version

• ›Mouth and nose together. Use whatever gets enough air in. At easy paces, some people breathe mostly through the nose. At hard paces, everyone ends up using their mouth.
• ›Relaxed shoulders, relaxed jaw. Tension in the upper body makes breathing feel harder than it is.
• ›Breathe into your belly, not just your chest. Let your stomach move as you inhale rather than lifting your shoulders.
• ›Let pace set the rhythm. Easy running gets slow, deep breaths. Fast running gets fast ones. That's not a problem to fix.
• ›Use breathing as a pace check. On easy runs, you should be able to speak in full sentences. If you can't, slow down.

If you're just starting, the most useful breathing advice is to run slower than feels necessary. A first 8 weeks you can follow should be built on runs easy enough that you can talk, with walk breaks when you need them. Breathlessness in the first few weeks is normal. It eases as your fitness improves, and that's not a technique you need to learn.

Breathing and pace: the talk test

The most useful thing about your breathing is what it tells you about effort. Coaches have used the talk test for decades because it works without a watch:

Most of your running should sit in the top row. That's coaching convention, not physics, but it's the reason most runners get fitter by slowing down.

Good breathing on hard efforts comes from being fit enough for the effort, not from a breathing trick. Coordination helps too. Running form drills before quality sessions make the fast running smoother, and smoother running feels easier to breathe through. Running form drills covers a 10-minute routine.

Should you breathe through your nose or mouth when running?

Both, for most people, most of the time.

Nose-only breathing has become a trend, and at easy paces some runners like it as a built-in speed limit. If you can breathe comfortably through your nose, you're probably running easy. That's a useful feedback tool.

At high effort, it's a different story. In a 2025 study of 12 healthy adults doing maximal cycling tests, breathing exclusively through the nose reduced peak exercise capacity because of ventilatory limitation, with only minor effects at rest and at submaximal effort (Mapelli et al., 2025). Small study, cycling not running. But it matches common sense: when you need a lot of air, use the bigger opening.

Practical version: nose breathing on easy runs if you like it, mouth and nose together whenever you need more air, and no guilt either way.

Rhythmic breathing: does counting steps help?

Rhythmic breathing means matching your breaths to your steps, for example inhaling for three steps and exhaling for two. It's popular, and there's real science underneath the idea.

Runners do tend to sync breathing with their stride. In a classic study, Bramble and Carrier recorded human runners using several locomotor-respiratory coupling patterns (4:1, 3:1, 2:1, 1:1, 5:2 and 3:2 strides per breath), with a 2:1 coupling appearing to be favored (Bramble and Carrier, 1983). In other words, your body tends to do this on its own.

Can you train it on purpose? In a small 2023 proof-of-concept study, 16 novice-intermediate female runners using step-synchronized sound guidance increased how often their breathing was coupled to their steps (Harbour et al., 2023). That shows coupling can be guided. It doesn't show it makes you faster.

So try it if it helps you settle into a rhythm, especially early in a run or on hills. If counting makes you tense, stop counting. The pattern your body chooses is usually fine.

Breathing on hills

Hills make you breathe harder at the same pace, because they're harder. The fix isn't a special breathing technique. It's slowing down on the way up so your effort stays steady.

On climbs, shorten your stride, keep a quick cadence, stay tall and keep your shoulders relaxed. Your breathing will get faster. That's fine. It's one of the hill running benefits: a strong aerobic effort at a lower speed.

Breathing in the first few minutes

The first five to ten minutes of a run often feel worse than the rest. Your breathing gets ahead of you before your body settles into the effort.

The fix is a proper start. For easy runs, start slower than your easy pace. For hard sessions, use a running warmup of easy jogging, drills and strides so the first hard rep isn't also your body's first wake-up call.

Breathing in races

Race breathing is mostly a pacing outcome. Go out too fast and you'll be breathing hard by the second mile, which means you'll be paying for it later. Start controlled and build. Running the second half faster than the first is the classic way to race well, and if you're wondering what is negative split in running, it's exactly that, and it keeps your breathing under control for longer.

Before short races, warm up thoroughly. A short set of A-skips and B-skips and a few strides gets your breathing up before the gun so the first kilometer doesn't feel like a shock.

Breathing in heat and cold

Heat. Running in the heat makes the same pace feel harder, and breathing gets faster with it. Run by effort rather than by the pace on your watch, and accept a slower run.

Cold. Very cold, dry air can feel harsh on the throat and chest. A buff or scarf over your mouth can make it more comfortable. If cold air triggers wheezing, tightness or coughing, that's a reason to talk to a doctor, not a reason to push through.

How to breathe when running with asthma

This is a medical question before it's a coaching question.

Asthma symptoms can be triggered by exercise, cold air and air pollution, among other things, according to the NHS. The same NHS page recommends exercising regularly, always having your inhaler with you, and getting advice from your doctor or nurse about exercising safely if exercise triggers your symptoms.

So, practically:

• ›Talk to your doctor or asthma nurse about your running, your warm-up and how any medication fits around it.
• ›Carry your inhaler on every run.
• ›Warm up gradually rather than starting fast.
• ›Pay attention to triggers like cold air, pollen and pollution, and adjust where and when you run.
• ›Stop if symptoms come on and follow your asthma action plan.

None of the breathing techniques in this post are a treatment for asthma. If you get breathless, wheezy or tight-chested when running and you don't have a diagnosis, see a doctor.

Side stitches

A side stitch is a sharp pain under the ribs, usually on one side. Nobody fully agrees on what causes it, so advice on how to get rid of side stitch when running is mostly practical rather than proven: slow down, breathe deeply, press gently on the spot, and try changing your breathing rhythm. Eating or drinking a lot just before running seems to make them more likely for some people. If it's severe or keeps happening, see a doctor.

Cool down and recovery

After a hard session, your breathing takes a few minutes to settle. A short walk or easy jog helps you come down gradually rather than stopping dead. Do you need to cool down after running? Not elaborately. Five to ten minutes of easy movement is plenty.

When to see a doctor

Breathlessness on a hard effort is normal. These aren't:

• ›Chest pain or pressure.
• ›Wheezing, or a tight chest.
• ›Breathlessness that's out of proportion to the effort, or new.
• ›Dizziness or fainting.
• ›Breathlessness that doesn't settle with rest.

Stop running and get checked out.

How exrsz handles breathing

It doesn't coach your breathing. It handles the part that usually causes the problem: pace and load. exrsz builds a periodized plan from your goal, schedule, level and equipment, with running and lifting balanced in one plan, adapts each week to how you actually trained, and reshuffles missed sessions so you aren't cramming hard runs together.

FAQ

How should you breathe when running for beginners?

Through your mouth and nose together, relaxed, at whatever rhythm feels natural. If you can't speak in full sentences on an easy run, slow down or take a walk break.

Is it better to breathe through your nose or mouth when running?

Both is fine. Nose-only breathing can work at easy paces, but in a small study breathing only through the nose reduced peak exercise capacity at maximal effort (Mapelli et al., 2025).

What is the 3:2 breathing pattern for running?

It means inhaling over three steps and exhaling over two. Runners naturally use several breath-to-stride patterns (Bramble and Carrier, 1983), so use it if it helps you relax and drop it if it doesn't.

How do I breathe when running with asthma?

Talk to your doctor or asthma nurse about running, carry your inhaler, warm up gradually and avoid known triggers. The NHS recommends getting advice about exercising safely if exercise triggers your symptoms.

Why do I get out of breath so fast when running?

Usually because the pace is too fast for your current fitness. Slow down, take walk breaks if needed, and your breathing will improve as your fitness does.