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How to Breathe During a Hyrox Race

Mouth or nose, a breathing rhythm for the runs, one breath per rep on all eight stations, and what to do in the roxzone — plus why your breathing rate is a better pacing gauge than your heart rate.

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Nobody trains their breathing for Hyrox. Almost everyone loses time to it.

The race rarely breaks you on the sled. It breaks you in the forty metres after it, when your legs are willing, the roxzone is behind you — and your breathing has not caught up. That gap is mostly technique rather than fitness, which means it is fixable in weeks. Here is what to do with your breath on each run, each station, and every transition in between.

In short: Breathe through your mouth — at race ventilation, nose-only breathing is not physiologically available. On the runs, lock a rhythm to your cadence: roughly three steps in and two out at cruise, two and two when it bites. On every station, tie one breath to one rep and exhale on the effort — never hold your breath across a whole set. In the roxzone, take two deliberate long exhales before you accelerate. And judge your pacing by how fast you are breathing, not by your heart rate.

Last reviewed: August 2026. This article is general training information, not medical advice.

The short answer: exhale on the effort, one breath per rep

One rule covers almost the whole race: breathe out on the hard part of the movement, and never let a station take your rhythm away. Everything below is that rule applied to the eight stations.

Why Hyrox is a breathing race

Most athletes think of Hyrox as a running race with strength interruptions. Measured, it looks different.

In a study of eleven recreational Hyrox athletes, the average finish was 86.5 minutes, around 80% of it spent at "very hard" intensity and nearly all the rest at "hard". Peak heart rate averaged 185 bpm and peak blood lactate 8.5 mmol/l. Crucially, the stations produced significantly higher heart rate, lactate and perceived exertion than the runs — while taking up only about 38% of the time. It is a small sample, so treat the exact figures as indicative. The pattern is the point: the stations wreck your breathing, and the runs are where you pay for it.

There is a mechanical reason to care, too. Under heavy sustained work the diaphragm and abdominal muscles fatigue themselves, and fatiguing respiratory muscles compete with your legs for blood flow — pre-fatiguing them in the lab shortens time to exhaustion in the exercise that follows. That has not been tested on a Hyrox floor, so treat it as a plausible mechanism rather than a measured race effect. But it matches what athletes describe: a chaotic sled push does not only cost you sled time, it costs you the kilometre after it.

Nose or mouth? Settle it now

Nasal breathing is having a moment, and it does not survive contact with this race. The classic measurement of when people switch from nose to mouth put the change at a ventilation rate of roughly 35 litres per minute — the effort of an easy jog. Hyrox is raced far above that, so the nose cannot move enough air and forcing it means working harder to breathe for less of it.

Nasal breathing still earns its place in your easy aerobic runs and your warm-up, where it usefully caps intensity. On race day, breathe through your mouth from the first kilometre, and do not experiment with mouth tape or restrictive masks.

The runs: lock your breathing to your cadence

Runners naturally synchronise breathing with their steps — locomotor-respiratory coupling. It is more common in trained runners and at higher intensities, though whether it directly improves performance is still contested. Treat it as a coaching tool rather than a proven ergogenic aid: a fixed pattern gives you something to hold when the race gets loud in your head.

In · step 1In · step 2In · step 3Out · step 4Out · step 5Runs 1 to 4, at goal pace

• 3:2 — three steps in, two out — for runs 1 to 4 at goal pace
• 2:2 — from run 5 onward, and whenever the pace stops feeling controlled
• 2:1 — only in the last 200 m of the final run, where the cost no longer matters

The mistake worth avoiding is arriving at a station already gasping. If you need 2:1 on run 3, you are racing the first half of a race you intend to finish in the second. The Hyrox running plan covers run pacing itself; the running-pace calculator turns a target finish into the per-kilometre pace those rhythms are meant to hold.

The stations: three ways your breathing breaks

The eight stations fail your breathing in three distinct ways, and each has its own fix.

1

SkiErg

Metronome · exhale on the drive

2

Sled push

Breath-holder · one sharp exhale every second step

3

Sled pull

Breath-holder · brace the wall, keep air moving

4

Burpee broad jumps

Rep grinder · exhale on the jump, inhale on the drop

5

Rowing

Metronome · two breaths per stroke as it deepens

6

Farmers carry

Breath-holder · quick and continuous, reset the grip not the lungs

7

Sandbag lunges

Breath-holder · short breaths through the brace

8

Wall balls

Rep grinder · one rep, one breath, all 100

1. The breath-holders — sled push, sled pull, farmers carry, sandbag lunges. These feel like lifting, so athletes brace like lifters and hold their breath. Breath-holding produces the highest blood-pressure response of any breathing technique in resistance exercise, and a brief hold is only justifiable for near-maximal efforts lasting a few seconds. A 50 m sled push and a 200 m carry are not that. Brace the abdominal wall and keep short breaths moving through it: on the sled, one sharp exhale every second step; on the carry, quick and continuous, resetting your grip rather than your lungs.

2. The metronomes — SkiErg and row. The easiest stations to breathe well on, because the stroke hands you a rhythm. Exhale on the drive, inhale on the recovery. As the effort deepens most athletes need two breaths per stroke — take them deliberately rather than letting the pattern fall apart.

3. The rep grinders — burpee broad jumps and wall balls. This is where the race is usually lost. At the bottom of a burpee, chest on the floor, breathing is mechanically awkward and most people simply stop; exhale on the jump and inhale as you drop, so no rep is silent. On wall balls, exhale hard on the throw and inhale on the catch and the descent. One rep, one breath, all 100.

The roxzone: two long exhales before you accelerate

The transition zone is the one place in the race where you can deliberately change your breathing without paying for it in output.

Be honest about what that buys. In a controlled trial, slow breathing during rest between heavy squat sets improved heart-rate recovery but did not preserve power or bar velocity. Recovery breathing calms the system; it does not restore your legs.

It is still worth having, because the roxzone is where most athletes either panic or dawdle. A workable routine: two long exhales — out roughly twice as long as in — over the first few metres, then settle into your run rhythm before you reach run pace. Rhythm first, pace second, is the part most people have backwards.

Use your breathing rate as your pacing gauge

Heart rate is a poor in-race gauge for Hyrox. It lags behind changes in workload and stays pinned high through the transitions, so it tells you little about whether the last station cost you too much.

1. 3–4Three or four words per breathOn plan

   Working hard, still in control. · Hold this. It is the pace you can repeat eight times.

2. 2Two words per breathAt the limit

   Right on the edge of what you can sustain. · Hold the pace — do not raise it — and let the next run settle you.

3. 1One word, or nonePast the limit

   You are paying for the last station with the next three. · Slow the next run deliberately and buy the time back.

Breathing rate does not have that problem. Research on respiratory frequency shows it tracks perceived effort more closely than heart rate or oxygen uptake and responds within seconds to the switch between work and recovery — roughly 80% of maximum breathing rate corresponding to "hard" effort and about 88% to "very hard".

You cannot read a percentage mid-race, so use the field version — a talk test in the roxzone:

• Three or four words per breath — on plan
• Two words — right at the limit; hold the pace, do not raise it
• One word, or none — you are ahead of your pacing. Slow the next run and buy the time back

That check does most of what a heart-rate strap promises and none of what it fails at. If it says you are over the limit in every race, the problem is the pacing plan rather than your lungs — why you're not getting faster at Hyrox works through finding the real limiter.

When breathing goes wrong: stitches and wheeze

A side stitch — exercise-related transient abdominal pain — is common: around 70% of runners report one within a year. The leading explanation is irritation of the parietal peritoneum, the membrane lining the abdominal wall, and the strongest provoking factor is what you drank and ate. Large volumes within two to three hours of the start, and concentrated sports drinks in particular, raise the risk — so cut them in the final hour before your wave.

Wheeze, a tight chest, or a cough that will not settle after hard efforts is a different matter. Exercise-induced bronchoconstriction is common in athletes and frequently undiagnosed, and symptoms alone are neither sensitive nor specific enough to diagnose it — professional bodies recommend objective testing. This article is general training information and not medical advice: if that sounds like you, see a doctor before changing anything about your training.

What to train before race day

Three things, in order of return.

1. Compromised running is breathing training. Nothing rehearses the actual problem — running with your heart rate already at the ceiling — better than going straight from a station into a run with no extra rest. The 12-week Hyrox training plan covers where that sits in a block.
2. Practise the patterns at race reps. A breathing rhythm survives fatigue only if you have rehearsed it fatigued. Full station volume — 100 wall balls, the full 80 m of burpee broad jumps — is where it either holds or does not.
3. Inspiratory muscle training, if breathing is genuinely your limiter. Five weeks of daily inspiratory training at 50% of maximal inspiratory pressure raised inspiratory strength by 17% and blunted the cardiovascular response to hard breathing work. Meta-analyses in endurance sport find real but modest and variable performance effects, so treat it as a small targeted addition, not a replacement for aerobic volume.

Frequently asked questions

Should I breathe through my nose during a Hyrox race?

No. The switch from nasal to mouth breathing happens at around 35 litres of air per minute — roughly an easy jog — and a Hyrox race is spent far above that. Nose-only breathing cannot supply the air, and forcing it increases the work of breathing for less oxygen. Keep nasal breathing for easy aerobic runs and warm-ups, where it usefully caps your intensity, and breathe through your mouth from the first kilometre on race day.

Should I hold my breath on the sled push?

No — not across the whole 50 m. Breath-holding produces the largest blood-pressure response of any breathing technique in resistance exercise, and it is only worth it for near-maximal efforts lasting a few seconds. Brace your abdominal wall for stiffness, then keep short, sharp exhales moving through the brace — roughly one every second step. The same applies to the farmers carry and the sandbag lunges.

How do I stop getting a stitch during a Hyrox race?

Most of the fix happens before the start: large volumes of food or drink within two to three hours of your wave raise the risk, and concentrated sports drinks are the most provocative. If one arrives mid-race, the responses athletes report most often are deep breathing, pressing on the painful spot, stretching the side and bending forward. The practical version is to exhale long and hard through pursed lips while pressing under the ribs, and expect to lose seconds rather than the race.

Does breathing training actually make you faster at Hyrox?

Modestly, and it is not the first thing to fix. Inspiratory muscle training measurably strengthens the breathing muscles and reduces the cardiovascular cost of hard breathing, and meta-analyses in endurance sport show real but small and variable performance gains. Compromised running and a sane pacing plan will move your finish time further. Add inspiratory work when breathing is clearly your limiter, not as a substitute for aerobic volume.

The bottom line

• Exhale on the effort and attach a breath to every rep. The stations, not the runs, are where breathing falls apart.
• Mouth breathing on race day, rhythm tied to your cadence on the runs, two long exhales in every roxzone.
• Pace by how fast you are breathing, not by your heart rate — it responds in seconds, and heart rate does not.

Want the training around it? The Hyrox training guide covers the whole build, the Hyrox running plan covers the half of the race that decides your time, and the Hyrox training plan overview shows how a plan is put together for your race date.

Sources

1. Brandt et al. (2025), Frontiers in Physiology — acute physiological responses and performance determinants in Hyrox
2. Nicolò, Massaroni & Passfield (2017), Frontiers in Physiology — respiratory frequency during exercise: the neglected physiological measure
3. Niinimaa et al. (1980), Respiration Physiology — the switching point from nasal to oronasal breathing
4. Romer & Polkey (2008), J Appl Physiol — exercise-induced respiratory muscle fatigue: implications for performance
5. Witt et al. (2007), J Physiol — inspiratory muscle training attenuates the human respiratory muscle metaboreflex
6. Morton & Callister (2015), Sports Medicine — exercise-related transient abdominal pain (ETAP)
7. Linsenbardt et al. (1992), Br J Sports Med — effect of breathing techniques on blood pressure response to resistance exercise
8. Buxton et al. (2024), J Hum Kinet — slow breathing during inter-set recovery and power in the back squat
9. Parsons et al. (2013), Am J Respir Crit Care Med — ATS clinical practice guideline: exercise-induced bronchoconstriction
10. HYROX: The Fitness Race — official race format and stations