Nasal Breathing While Running: When and How to Use It

Should you breathe through your nose when running?

You can breathe through your nose on easy runs if it feels comfortable. Nasal breathing while running is optional; as effort rises, breathing through your mouth or both your nose and mouth allows air to move more freely.

Nasal-only breathing means both inhaling and exhaling through your nose. Inhaling through your nose and exhaling through your mouth is a different approach. Neither needs to become a rule for every workout. If restricting airflow leaves you struggling for air, open your mouth or ease the pace.

My recommendation is to establish what comfortable running feels like before experimenting with breathing routes. An occasional nasal-breathing check may help you notice your effort, but keeping your mouth closed is a poor training goal in itself. The session should build your ability to run, without becoming a contest over how much breathing restriction you can tolerate.

What nasal breathing while running can realistically offer

The nose filters incoming air and helps warm and humidify it. Those conditioning functions can reduce airway drying, as discussed in Morton and colleagues’ exercise study. They offer a plausible reason some runners might find nasal breathing more comfortable, but that is an inference, not a demonstrated comfort benefit from this study.

Individual airflow matters: congestion or narrower nasal passages can make the same technique feel restrictive. Our related article on the benefits of breathing through the nose while running explores the topic further. Keep the distinction between airway conditioning and athletic performance in mind when weighing any proposed benefit.

For runners learning how to breathe while running long distance, a quieter breathing pattern can be interesting feedback. It does not, by itself, demonstrate better oxygen delivery or fitness. There is no established universal adaptation deadline, and faster race times cannot be promised simply because someone learns to breathe through their nose.

How to breathe while running for beginners

Start with an easy pace and unforced breathing through whichever route feels comfortable. The American Lung Association’s breathing basics for runners recommends comfortable jogging with breaks before increasing intensity.

Picture it: in this hypothetical beginner session, a runner sets off around a park beside a companion, determined to complete every jogging interval with their mouth closed. Before the first bend, getting the next breath has become their main concern. They walk to recover, then start again more slowly and stop restricting their breathing.

During the next interval, the runner tries finishing a sentence to their companion. When talking becomes awkward, they walk before becoming exhausted. By the end of this imagined outing, they have found a starting pace they can repeat. On their next visit, they begin at that slower pace instead of recreating the struggle at the first bend. The breathing experiment has served its purpose by changing a pacing decision.

To try this yourself, warm up with comfortable walking, alternate short jogs with walking breaks, and finish while the session still feels manageable. If you want to explore nasal breathing, try it briefly on a flat, easy stretch after settling into the run. Return to your usual breathing when it starts requiring effort; there is no minimum duration to achieve. Avoid deliberately drawing the biggest possible breath each time.

Should I exhale through my nose or mouth?

You can exhale through either route. When deciding how to exhale through your nose or mouth while running fast, choose the route that lets the breath leave without strain or breath holding.

Inhaling through your nose and exhaling through your mouth may feel natural at an easy pace. There is no need to make the inhale and exhale follow identical routes. Let each exhale finish without squeezing your lungs empty or extending it until you are desperate for the next inhale.

If counting footsteps helps you settle into a rhythm, notice how many steps fall within each breath. Allow the count to change on a hill or during an acceleration. No single step count needs to govern the entire run. Abandon counting if it becomes another task to manage; a rhythm is useful only while it helps the run feel coordinated.

How to breathe while running long distance

Manage breathing on long runs by adjusting your pace for hills, heat and accumulating fatigue. Duration does not require a special breathing pattern, but it does require room to respond when the same pace starts feeling harder.

On an easy long run, aim to speak in full sentences without gasping. If a hill makes that difficult, slow down, using shorter steps or walking as needed. After the crest, keep the effort easy until speaking feels comfortable again. Give yourself that recovery before accelerating; immediately chasing your earlier pace can carry the strain into the next stretch.

Comfortable nasal breathing cannot pinpoint a training zone because nasal airflow varies between runners. Consider conversation and perceived effort alongside pace. The ability to keep your mouth closed on one cool, flat outing does not establish the pace you should hold on every long run.

To control breathing while running fast within a longer workout, let the demands of that faster segment guide your effort. The easy-run conversation check is not a requirement during a planned hard interval. Be clear about which part of the workout you are doing before interpreting heavier breathing as a pacing mistake.

How to breathe while running fast or racing a 5K

During fast running or a 5K race, allow unrestricted breathing through your mouth and nose. Faster, heavier breathing is expected at hard effort; forcing a quiet pattern can interfere with the workout.

For an all-out 5K, a practical pacing approach is to keep the opening kilometre controlled, settle into a sustainable middle effort, then increase effort toward the finish if you can. A loud breath early in the race does not automatically mean something is wrong, but an effort you cannot sustain is a reason to reassess your pace. An easy 5K, by contrast, should allow conversation: distance alone does not determine intensity.

Keep your hands and shoulders relaxed rather than bracing your upper body with every breath. Between training intervals, use the planned recovery and check that breathing is settling before accelerating again. If it remains unusually difficult, stop the session.

If you use military-style box breathing, keep it separate from the hard running itself. Breath holds and rigid counts can restrict ventilation when it needs to respond to the work. Race day is also a poor time to introduce an unfamiliar breathing routine; practise any optional calming routine beforehand in a comfortable setting.

Does nasal breathing increase VO2 max?

Nasal breathing alone has not been reliably shown to increase VO2 max, the maximum rate your body can use oxygen during exercise. Breathing frequency, running economy and perceived breathlessness are different measurements.

In the BreathWISE study, nasal-only breathing reduced peak oxygen uptake and workload during cycling tests in 12 healthy participants compared with the other tested breathing conditions. The study examined immediate responses. It did not test adaptations from weeks of training in runners, so it cannot settle every question about longer-term practice.

Even maintaining performance after becoming accustomed to nasal breathing would not establish an increase in VO2 max. Running economy concerns the oxygen cost of a given pace; feeling less breathless concerns the runner’s experience. Neither can be substituted for a measured change in maximum oxygen uptake.

For runners deciding how to breathe while running a 5k, the relevant question is whether a technique helps them execute the intended effort. A smoother-feeling breathing pattern may be welcome, but a claim that it improves performance needs evidence beyond that sensation.

Nasal breathing and running heart rate: assess the whole run

A lower heart rate at a slower pace does not demonstrate improved cardiovascular fitness. Pace, gradient, temperature and fatigue complicate comparisons, while measurement variability adds uncertainty.

If you want to assess a change, keep a simple record across comparable easy outings: note your route and pace, heart rate if available, and how the effort felt. Add whether you used nasal or unrestricted breathing and whether congestion affected the run. A short note such as “hot afternoon, walked the hill” may explain more than the average heart rate alone.

Look for patterns rather than treating one favourable reading as a result. If both pace and breathing route changed, you cannot isolate the contribution of either. The record can help you choose a manageable effort next time; it is not a controlled experiment or proof that the breathing technique caused a fitness improvement. You do not need to turn every outing into a comparison to learn from it.

When nasal breathing feels blocked or unusually difficult

Beginners learning how to breathe while running should distinguish a blocked nose from unusual breathlessness. Do not force air through an obstructed nose or tape your mouth shut during exercise. Recurring congestion or obstruction deserves individual assessment.

Mouth breathing during strenuous exercise differs from persistent mouth breathing at rest or during sleep. Changing the breathing route during a run does not address the cause of ongoing nasal blockage. When seeking advice, explain whether the problem occurs only while exercising or also at other times.

Stop running if you develop unusual breathing difficulty, wheeze or chest tightness. Recurrent symptoms warrant evaluation for possible exercise-induced bronchoconstriction, as the American Lung Association explains. These symptoms can have other causes, so do not diagnose yourself from a breathing experiment. Note when symptoms start and whether they continue after stopping; that information can help a clinician assess what is happening. Seek urgent medical help for severe breathlessness or chest pain.

Conclusion: Let breathing support the effort

Choose the purpose of your next run before choosing a breathing technique. An easy outing gives you room to explore comfort; a hard session calls for breathing that can respond freely to the workload. Neither requires proving that you can keep your mouth closed.

The beginner in the park leaves with something more useful than a nasal-breathing duration: a pace that makes the next outing approachable. Take that same practical standard into your own training. Keep a technique when it helps you complete the run you intended, and change it when managing the technique starts taking over the run.