Breathwork for Athletes: Mechanics That Change Output

Most training advice about breathing stops at "remember to breathe". It is well meant and almost useless. Breathing is the only autonomic function you can seize manual control of at will — the single lever that reaches both the muscular system and the nervous one — and treating it as an afterthought wastes it.

The interesting part is that better breathing is not about getting more air. It is about mechanics: which muscles do the work, how the ribcage moves, how much carbon dioxide you tolerate, and how quickly you can switch between a system geared for effort and one geared for repair.

None of this requires a course, a candle or a special mat. It requires understanding four things.

The diaphragm is a muscle, and most of us under-use it

The diaphragm is a dome of muscle beneath the lungs. When it contracts it flattens downward, the ribs swing out, pressure in the chest drops and air is pulled in. That is the whole mechanism, and it is meant to do the large majority of quiet breathing.

Under stress, deadlines, anxiety or simply years of sitting compressed at a desk, the pattern shifts upward. The scalenes, sternocleidomastoids and upper trapezius — accessory muscles designed to help during hard efforts — start doing routine work. The result is a shallow, high, fast breath, a permanently busy neck, and a diaphragm that has quietly gone part-time.

You can check your own pattern in ten seconds. One hand on the upper chest, one on the lower ribs. Breathe normally. If the top hand travels first and the lower ribs stay still, your accessory muscles have taken over the day shift.

Carbon dioxide, not oxygen, runs the urge to breathe

Here is the fact that reorganises everything: the desperate need to breathe you feel at the end of a hard interval is not caused by lack of oxygen. Your blood is close to fully saturated with oxygen almost all the time. What drives the urge is rising carbon dioxide, detected by chemoreceptors that are extremely sensitive to it.

This has a practical consequence. Tolerance to carbon dioxide is trainable, and people with a low tolerance breathe fast and shallow, feel air hunger early, and panic sooner in hard efforts. People with a higher tolerance stay composed while the same chemistry is happening inside them. Much of what looks like superior fitness in a training partner who never seems flustered is partly a calmer response to CO2.

It also explains why hyperventilating before an effort backfires. Blowing off carbon dioxide does not load you with more usable oxygen; it changes blood chemistry, narrows blood vessels to the brain and often produces light-headedness and tingling. Fast breathing is a response to effort, not a preparation for it.

Nose or mouth

At rest and at low intensity, the nose is the better instrument. It filters, warms and humidifies air, adds resistance that slows the breath naturally, and releases nitric oxide from the sinuses, which supports gas exchange in the lungs. Nasal breathing at conversational pace is also a useful pace governor: if you cannot hold it, you are working harder than you intended.

At high intensity the mouth wins, because the nose cannot move enough air fast enough, and pretending otherwise costs you output. The useful habit is not nasal purity but knowing which one you are in, and defaulting to the nose everywhere it is comfortable — easy runs, walks, warm-ups, sleep, and everyday life.

Breath under load

Lifting has its own breathing rules, and they are mechanical rather than mystical. Air held in a braced trunk turns the abdomen into a pressurised cylinder that stabilises the spine — the reason a heavy set is not breathed through casually. The sequence is: breathe in to the belly and low ribs, brace as though about to be pushed, execute, then exhale at the top or between repetitions.

Two honest caveats. Breath-holding under heavy load raises blood pressure transiently, which is why anyone with cardiovascular concerns, hypertension, glaucoma, or who is pregnant or postpartum should have this conversation with a health professional rather than with an article. And bracing is not sucking your stomach in — the abdomen expands outward and stays firm.

For endurance work, the useful skill is rhythm rather than pressure: a repeatable pattern tied to your cadence, with an emphasis on complete exhalation. Incomplete exhalation is the most common reason people feel they cannot get enough air. The problem is at the wrong end of the cycle.

The recovery switch

Long exhalations activate the parasympathetic branch of the nervous system. Slow breathing at roughly six cycles per minute — around five seconds in, five seconds out — has been repeatedly shown to increase heart rate variability and shift the body toward a state associated with recovery and digestion.

Five minutes of this after a hard session, or before sleep, does something no supplement will. It is also the only recovery tool that costs nothing, works anywhere, and needs no equipment. If you take one practice from this article, take that.

Breath as part of the method

Breath work is one of the quieter pillars in the programme being designed for Phoenix Oasis. The plan places it deliberately: before strength sessions as preparation and bracing practice, on the trail as pace regulation in humidity, and at the end of the day beside the water as the switch that closes a training day.

The retreat, on thirty hectares near Rivera in Huila, Colombia, will open on 30 June 2028. Until then, the four ideas above are yours to practise anywhere, and they will still be the same four ideas when the doors open. You can read how the days are being built in the planned retreats.