Breathwork for athletes uses structured breathing to raise CO2 tolerance and oxygen efficiency, so you hold a higher output at the same perceived effort and recover faster between efforts. It needs no equipment, and most of it fits into 10 minutes a day.
How Breathwork Improves Athletic Performance
1. CO2 Tolerance and the Anaerobic Threshold
Most athletes hit their CO2 limit long before they run short of oxygen. When CO2 builds faster than you tolerate it, you breathe harder than the workload needs and feel gassed early. Nasal breathing and breath hold training raise that limit. A fighter feels it in the third round; a runner sees a higher anaerobic threshold.
2. Oxygen Efficiency and VO2
Oxygen efficiency is how well your body delivers and uses oxygen, and lighter, slower nasal breathing improves it. Higher CO2 tolerance shifts the oxyhemoglobin dissociation curve so more oxygen is released to working muscle, and nasal breathing adds nitric oxide that supports oxygen uptake.
3. Heart Rate Variability and Recovery
Heart rate variability (HRV) tracks recovery. Shifting into the parasympathetic nervous system helps lower cortisol so the body can repair. Five minutes of slow diaphragmatic breathing at roughly six breaths per minute raises HRV in real time and improves the seven-day average when practiced daily. Endurance adaptations are consolidated during deep sleep, which is why the protocol below ends with an evening session.
4. Arousal Regulation and Focus
Between rounds, sets, or plays, athletes need to drop sympathetic tone fast. The physiological sigh does it in under 90 seconds. Box breathing takes longer but keeps you sharper, which is why shooters and tactical teams use it.
The Best Breathing Exercises for Athletes
Pick one or two per session to match that day's training.
Nasal breathing under load
Breathe through the nose in daily life and on easy and moderate training. Start at efforts where keeping the mouth closed is comfortable, then extend that intensity over a 6 to 12 week block.
CO2 tolerance training and the BOLT score
Measure your BOLT score: after a normal exhale, pinch the nose and time the comfortable hold until the first definite urge to breathe. Most athletes start in single digits. Raise it with light breath holds after a normal exhale and reduced-breathing drills.
Breath hold training
Structured breath holds, sometimes paired with inspiratory muscle training, build tolerance and composure under air hunger. Progress slowly and never chase a maximal number. Never do breath holds in or near water without trained supervision.
Box breathing
Inhale, hold, exhale, and hold again, each for an equal count. Use it before competition to settle nerves without going flat.
The physiological sigh
Take a double inhale through the nose, then a long exhale through the mouth. One to three rounds is enough to lower heart rate between efforts.
Slow diaphragmatic breathing
Breathe about six times per minute from the diaphragm rather than the chest, also called belly breathing. Use it in your cooldown or at night to shift into parasympathetic recovery before sleep. The 4-7-8 and 7-11 patterns do a similar job.
Breathing Techniques for Running and Endurance
Run easy and zone-two efforts nasal-only to build CO2 tolerance without adding training stress. Tie breath to foot strike with rhythmic breathing; a 3:2 inhale-to-exhale pattern is a common starting point. Finish with slow diaphragmatic breathing. When the pace you can hold nasal-only rises, your running economy is improving.
Breathwork by Sport
Endurance sports
Cycling, triathlon, and rowing use the running approach above. Nasal-only intervals and CO2 work push the anaerobic threshold and help manage blood lactate on hard efforts.
Combat sports
A wrestler, BJJ competitor, or boxer who drops sympathetic tone in the 60 seconds between rounds starts the next one with a lower heart rate. Arousal control also eases performance anxiety and excess muscle tension.
Team and field sports
Football, basketball, soccer, and lacrosse players use the physiological sigh or box breathing between plays, plus longer parasympathetic sessions for sleep across a long season.
Tactical athletes
Military, fire, and law enforcement teams use box breathing for stress inoculation. It has been embedded in tactical doctrine for over a decade.
A Simple Weekly Breathwork Protocol for Athletes
- Daily: nasal breathing as your default, awake and asleep.
- 5 to 10 minutes most days: CO2 tolerance work (light breath holds, reduced breathing) or slow diaphragmatic breathing.
- 2 to 3 sessions per week: nasal-only intervals inside easy or zone-two training.
- As needed: the physiological sigh or box breathing between efforts and on game day.
- Evening: a short parasympathetic session before sleep.
Performance Breathing Videos in Our Online Course
Our online Breathwork course shows each protocol here on video, including nasal breathing progressions, BOLT-style assessment, and slow diaphragmatic work.
For the science, Patrick McKeown's Oxygen Advantage books cover nasal breathing, BOLT, and CO2 tolerance in depth. We teach those principles inside a broader Breathwork practice.
Frequently Asked Questions
What is Breathwork for athletes?
Structured breathing that raises CO2 tolerance and oxygen efficiency and speeds recovery between efforts: nasal breathing, breath holds, box breathing, the physiological sigh, and slow diaphragmatic breathing.
How do you build CO2 tolerance for endurance?
Light breath holds after a normal exhale, reduced-breathing drills, and nasal-only easy intervals, tracked with your BOLT score. You end up breathing less for the same workload.
Does nasal breathing improve athletic performance?
Yes. It warms and filters air, increases nasal nitric oxide (which supports oxygen uptake), and raises CO2 tolerance. At maximal efforts the mouth still opens, but a higher nasal ceiling means more of the effort happens before that point.
How does Breathwork improve stamina and endurance?
It raises CO2 tolerance and oxygen efficiency, so you hold a higher output at the same effort, and better HRV and sleep let you train more consistently.
Is breath hold training safe for athletes?
Light, controlled breath holds after a normal exhale are generally safe for healthy athletes and are the basis of CO2 tolerance training. Maximal holds, repeated hyperventilation, and intermittent hypoxia carry real risk, and breath holds should never be done in or near water without supervision. Athletes with cardiovascular conditions, uncontrolled hypertension, or epilepsy, or who are pregnant, should consult a doctor first. Never push a hold to distress.
How often should athletes practice Breathwork?
Nasal breathing daily, 5 to 10 minutes of CO2 tolerance or slow breathing most days, and nasal-only intervals two or three times a week. Consistency matters more than volume.
Practice These Protocols on Video
Coaches who want to lead these drills with teams can train as facilitators.
To feel the work in person first, try a Liquid Breathwork class in Arizona.