Breathing While Running: The Complete Guide

Why breathing is different when walking than at rest

At rest, most people breathe superficially and automatically. That works fine: your body takes in enough oxygen and exhales enough CO₂ without you consciously thinking about it.

Everything changes while walking. Your muscles suddenly require five to twenty times more oxygen than at rest. Your heart pumps faster, your breathing speeds up, and if you don't keep up with that increased demand, you end up gasping for air.

That craving is not always a fitness problem. It is often a technique problem: you are breathing too shallow, too fast, or in a rhythm that does not match your pace. These are things you can change, even without getting fitter.

The basics: abdominal breathing

The most impactful adjustment you can make to your walking breathing is switching from chest breathing to abdominal breathing, also called diaphragmatic breathing or diaphragmatic breathing.

During chest breathing, the upper lung fields fill, but the deeper parts are hardly touched. With abdominal breathing you use the diaphragm: the abdomen pushes out when you inhale, allowing the lungs to fully expand. More lung volume per breath = more oxygen per breath = more efficient walking.

How do you learn it? With this exercise:

1. Lie on your back. Place one hand on your stomach, the other on your chest.
2. Breathe in. Which hand goes up first? With abdominal breathing this is the hand on the stomach.
3. Practice: breathe in through the nose, let the abdomen expand first, then the chest. Exhale: first the chest, then the abdomen.
4. Repeat 10 times.

Once this feels familiar, practice it while walking. Then while walking quietly. It takes a few weeks to become automatic, but once it is, you will notice the difference immediately.

Nose or mouth? The honest answer

This is one of the most discussed questions in the running world, and the answer is more nuanced than most sites would lead you to believe.

At a leisurely pace: breathing in through the nose is fine and has advantages. The nose filters air, warms it (useful in cold weather) and humidifies it. Nose breathing also automatically forces you to a calmer, deeper rhythm. If you can comfortably hold the nose, that's the better choice at low intensity.

At a higher pace: you cannot take in enough air through the nose alone. Research confirms that mouth breathing at high intensity leads to better oxygen absorption and more efficient CO₂ removal. Switch to mouth, or use a combination: in through the nose and one mouth at a time, out through the mouth.

Practical rule of thumb: Do you notice that nose breathing is no longer possible? Then that is a signal to either slow down your pace or switch to mouth or combined breathing. Use it as a sensor, not as a dogma.

Breathing through the nose in cold weather protects your airways somewhat against cold, dry air. Relevant if you are sensitive to asthma or respiratory complaints.

Breathing rhythm: breathe in the rhythm of your steps

One of the most effective techniques for controlled breathing is linking your breathing rhythm to your cadence. This is called locomotor-respiratory coupling, and scientific research shows that it makes your oxygen intake more efficient.

The principles: you count the number of steps while inhaling and exhaling, and maintain that rhythm consistently.

The 3:3 rhythm (inhale 3 steps, exhale 3 steps) is the starting point for most runners. These are guidelines, not fixed rules: experiment and feel what feels comfortable for you.

A practical tip: use music as a metronome. Choose a playlist whose BPM tempo matches your desired cadence, and sync your breathing to the rhythm of the music.

Also pay attention to your exhalation: Many runners do not exhale fully enough. A full exhalation completely pushes away old, CO₂-rich air and makes room for a fresh, deep inhale. Consciously activate your abdominal muscles when exhaling. That helps!

Posture and breathing are inextricably linked

A hunched back, slumped shoulders and a forward stretched head constrict the chest. Those who collapse breathe more superficially. Even though that person is not doing anything wrong.

This is why running technique and breathing are not separate:

• Straight head, look into the distance: opens the airways and allows the lungs to fully expand
• Shoulders low and back: gives the chest space
• Slight forward slope: keeps the body in one line, no collapse at the hips

Try it yourself: stand up straight and breathe deeply. Then fold your upper body slightly forward and inhale again. You immediately feel the difference in breathing space.

You can find more about posture while running in our guide to running technique.

Tempo is the fastest solution

If your breathing cannot be controlled, in nine out of ten cases the cause is simple: you are walking too fast.

The chatter test is your simplest tool: can you say a full sentence while walking without stopping for breath? Then you are walking in the right zone. Do you have to recover after three words? Slow down.

This sounds obvious, but it is ignored by almost every beginner. The tendency to start a little too quickly is instinctive, but the result is breathing that stops after just five minutes, and a workout that never feels comfortable again.

Running slower is not a weakness. It's the way you actually develop your aerobic system.

Side stitches: what they are, why they happen, and how to deal with them

Almost every runner knows it: that sharp, stabbing pain just below the rib cage. They always come at the wrong time, and they seem to appear randomly.

What exactly is a side stitch?

Scientists do not fully agree on the exact cause, but the most accepted explanation is an irritation of the peritoneum surrounding the diaphragm. With each step, the organs lightly pull on the diaphragm, which at the same time acts as a breathing muscle. That double strain (plus a possible reduction in blood flow to the diaphragm) can lead to cramps or tension that you feel as a stabbing pain.

Other contributing factors:

• Eating or drinking too shortly before training (especially sugary drinks)
• A hollow back or poor trunk stability
• Shallow or irregular breathing
• Starting too quickly without warming up

How do you prevent side stitches?

• Don't eat a large meal in the two hours before your workout
• Warm up thoroughly: start walking, build up gradually
• Breathe deeply and rhythmically: the 3:3 pattern helps relieve the diaphragm
• Work on your core: strong abdominal, back and torso muscles reduce the pulling forces on the diaphragm
• Avoid sugary energy drinks just before or during easy workouts

What do you do if you do get a side stitch?

Slow down your pace or take a walk. Then actively empty your lungs with a forceful exhalation. This relaxes the diaphragm and returns it to its full length. Repeat a few times.

That doesn't help? Stop for a moment. Stand up straight, extend your arms above your head, stretching your diaphragm. Or press lightly on the painful area with your hand and bend slightly forward. The pain usually disappears quickly as soon as you adjust your pace.

Breathing and intensity: the four zones

Your breathing is one of the best indicators of your training intensity, and it doesn't have to cost you a watch or heart rate equipment.

80 to 85% of your training volume should be in the endurance zone: the zone where you can still chatter. In that zone you build the aerobic base that makes you faster in the longer term. The more intense zones (15 to 20%) train your heart and lungs to process more oxygen.

Breathing can be trained: which leads to improvement

An additional advantage of training is that your breathing naturally improves. The more you walk, the stronger your breathing muscles become, the greater your lung capacity, and the more efficiently you use oxygen.

But you can also actively speed it up:

Breathing exercises outside of running: Yoga, meditation and targeted abdominal breathing techniques train your diaphragm and help you switch more quickly to deep, rhythmic breathing when you walk.

Conscious exhalation: During your next endurance run, practice breathing completely empty with each exhalation. Consciously activate your abdominal muscles. After a few kilometers you will notice that your breathing automatically becomes calmer and deeper.

Strides: Short accelerations of 20 à 30 seconds at the end of an endurance run train your heart-lung system at a higher intensity, without increasing the volume.

Frequently asked questions

Do you also want to know how to improve your running technique so that your posture supports your breathing? Read our guide on running technique. Just started running? Then the start-to-run guide is the best next step.