Breathing Is a Running Skill You Can Train
Most runners never think about how they breathe. They assume breathlessness is purely a fitness problem. But a 2022 review in Frontiers in Physiology found that evidence-based breathing strategies can reduce respiratory muscle fatigue and enhance running performance. How you breathe affects oxygen delivery, carbon dioxide removal, core stability, and even impact distribution across your body. The good news is that breathing is a trainable skill. Three techniques, when practised consistently, improve running efficiency at every level: diaphragmatic breathing (using your belly, not your chest), rhythmic breathing (synchronising breath to stride), and appropriate nose-mouth breathing for your intensity level.
The 3 Breathing Techniques Every Runner Should Know
Technique 1: Diaphragmatic (belly) breathing. Most people breathe shallowly using their chest muscles, especially under stress. Chest breathing limits lung capacity and engages small, easily fatigued muscles. Diaphragmatic breathing uses the diaphragm, a large dome-shaped muscle below the lungs, to draw air deeper into the lower lobes where oxygen exchange is most efficient. To practise: lie on your back with one hand on your chest and one on your belly. Breathe in through your nose and feel your belly rise while your chest stays relatively still. Breathe out slowly through your mouth. Once this feels natural lying down, practise it while walking, then during easy running. This is the foundation for all other breathing techniques.
Technique 2: Rhythmic breathing (breath-stride synchronisation). Rhythmic breathing means timing your inhales and exhales to your footsteps. The most recommended pattern for easy-pace running is 3:2, meaning inhale for 3 footsteps and exhale for 2. This creates an odd-number breathing cycle, which means the exhale, when your diaphragm is most relaxed and your core is least stable, alternates between your left and right foot strikes. This distributes impact stress evenly across both sides of your body rather than always loading one side. For harder efforts, shift to a 2:1 pattern (inhale for 2 steps, exhale for 1). For very easy recovery runs, a 4:3 pattern gives longer breathing cycles.
Technique 3: Nose-mouth breathing by intensity. At easy pace, breathing in through your nose and out through your mouth is efficient and helps warm, filter, and humidify incoming air. Nasal breathing also promotes a slower, deeper breathing pattern. But as intensity increases, nasal breathing alone cannot supply enough oxygen. At moderate and hard efforts, breathe in and out through both nose and mouth simultaneously. There is no performance benefit to forcing yourself to breathe only through your nose during hard running. Your body needs maximum airflow, and your mouth provides the largest airway.
How to Apply Breathing Technique to Your Running
- Start with belly breathing on easy runs. Your first goal is to replace chest breathing with diaphragmatic breathing during easy running. Spend 2-3 weeks practising belly breathing on every easy run. Place your hand on your belly occasionally to check. When belly breathing feels automatic at easy pace, you have built the foundation for everything else.
- Add rhythmic breathing once belly breathing is automatic. Count your footsteps as you breathe. At easy pace, try inhale-2-3, exhale-2 (3:2 pattern). It may feel awkward at first. Practise for 5-10 minutes at the start of each run, then let it become natural. Do not force it during hard efforts initially. Once the 3:2 pattern is comfortable, practise shifting to 2:1 during faster segments.
- Use breathing as a pace indicator. Your breathing pattern is one of the most honest intensity markers available. If you cannot maintain a 3:2 pattern, you are running harder than easy pace. If you cannot hold a 2:1 pattern, you are at or above your lactate threshold. Use this feedback to regulate pace without constantly checking your watch. Breathing that feels panicked or uncontrolled is a signal to slow down.
- Prevent side stitches with exhale timing. Side stitches are often caused by impact stress on the diaphragm and surrounding ligaments. Rhythmic breathing with an odd-step pattern (3:2) distributes impact across both sides. Additionally, exhaling as your foot opposite to the stitch side strikes the ground can relieve the pain. If you consistently get stitches on the right side, focus on exhaling as your left foot lands.
- Train your breathing muscles. Your respiratory muscles fatigue just like your leg muscles. Running longer and harder increases the demand on your diaphragm, intercostals, and accessory breathing muscles. Regular running training improves respiratory muscle endurance. You can also practise deep breathing exercises off the run: 5 minutes of slow diaphragmatic breathing daily strengthens the pattern and makes it more automatic under fatigue.
- Monitor breathing under fatigue for form insights. When breathing becomes laboured late in a run, it often coincides with running form breakdown: shorter strides, increased ground contact time, and higher cadence variability. If you track your running data with a tool like the Arion Running Analysis, you can correlate cadence and ground contact changes with when your breathing shifted, giving you objective data on your fatigue threshold and where form-specific work would have the greatest impact.
FAQ
Should I breathe through my nose or mouth when running?
Both, depending on intensity. At easy pace, breathing in through your nose and out through your mouth is efficient and helps warm and filter the air. As pace increases to moderate or hard effort, breathe through both nose and mouth simultaneously to maximise oxygen intake. Forcing nose-only breathing during hard running restricts airflow and increases perceived effort. Your body will naturally want to open your mouth when it needs more air. Let it.
What is the best breathing pattern for running?
A 3:2 rhythmic pattern (inhale for 3 steps, exhale for 2) works well for easy-pace running. It creates an odd-numbered cycle that alternates which foot strikes during exhale, distributing impact stress evenly. For harder efforts, shift to 2:1 (inhale for 2 steps, exhale for 1). The key principle is matching breathing rhythm to stride rhythm and using an odd-step pattern to balance impact across both sides of the body.
Why do I get out of breath so quickly when running?
Three common reasons: starting too fast (your cardiovascular system needs 3-5 minutes to ramp up), shallow chest breathing (not using your diaphragm to breathe deeply), and running at an intensity beyond your current fitness level. Fix these by starting every run at a conversational pace for the first 5-10 minutes, practising belly breathing, and slowing down until you can maintain a steady breathing rhythm. Breathlessness is a signal that your pace exceeds your current aerobic capacity.
Does breathing technique actually improve running performance?
Yes. A 2022 review of evidence-based breathing strategies for running found that proper breathing technique reduces respiratory muscle fatigue, which can improve endurance performance. Rhythmic breathing improves the distribution of impact forces and may reduce injury risk. Diaphragmatic breathing improves oxygen exchange efficiency compared to shallow chest breathing. While breathing technique alone will not transform your speed, it removes an unnecessary limiter for many runners.
How do I stop getting side stitches when running?
Side stitches are linked to diaphragm stress and are more common when breathing is uncontrolled. Three strategies help: use a rhythmic 3:2 breathing pattern to distribute impact evenly, avoid eating within 1-2 hours before running (a full stomach increases diaphragm pressure), and exhale when the foot opposite to the stitch side contacts the ground. If a stitch occurs, slow your pace, take several deep belly breaths, and gently press on the stitch area while exhaling. Most stitches resolve within 1-2 minutes.
