An apnea walk is a breath hold performed while walking. Because working muscles produce carbon dioxide far faster than a body at rest, contractions arrive within 20–40 seconds instead of a minute or more — so you get the same CO₂ stimulus as a long static hold in a fraction of the time. It is dry, it needs no equipment, and it fits into a walk you were taking anyway.
Key takeaways
- Walking raises the rate at which you make CO₂, so a 40-second walking hold delivers a load comparable to a static hold two or three times longer.
- The trade-off is a narrower margin: you burn oxygen faster too, and you are upright when it runs low. The safety rules here are stricter than for a table, not looser.
- Beginners stop at the first contraction for the first two weeks. Pacing before tolerance.
- Two walks and two tables a week is a workable pattern. Massini et al. (2022) found breath-hold work, physical training and cross-training all improved static apnea time, so the mix matters less than the consistency.
Why movement changes everything
The urge to breathe tracks CO₂, not oxygen. That is not a figure of speech: hypercapnia is a rise in the partial pressure of carbon dioxide in the blood, and it is the signal that drives the breakpoint — the classic clinical test of that sensitivity is a breath hold under raised CO₂ (Stanley et al., 1975, PMID 1145539). Walking raises your metabolic rate roughly three- to fourfold over sitting, so CO₂ accumulates several times faster during the hold. Two consequences follow:
- Time efficiency. A 40-second walking hold delivers a CO₂ load comparable to a static hold two or three times as long. A full session fits into 15 minutes.
- Specificity. Freediving, spearfishing and any real underwater work happen while moving. Training tolerance under a muscular load is closer to the target activity than sitting on a sofa is.
There is a trade-off. Because oxygen is also being consumed faster, the margin between “uncomfortable” and “hypoxic” is narrower than in a static hold. That is why the safety rules below are stricter, not looser, than for a CO₂ table .
How to do one, step by step
- Breathe up for 1–2 minutes while standing or walking slowly. Relaxed nasal breathing with a long exhale. No hyperventilation, ever.
- Take one comfortable inhale — about 80 % full, not a maximum pack.
- Start walking at an easy, even pace. No hills, no sprinting, no rushing.
- Keep walking until the contractions become firm, then stop walking and recover — do not push into a maximum while moving.
- Recover for 60–90 seconds of calm breathing while walking normally.
- Repeat for 6–10 rounds.
Beginners: end each hold at the first contraction for the first two weeks. That builds the habit and the pacing before it builds the tolerance. The struggle phase — everything after that first contraction — is where trained divers gain the most, and it grew by an average of 59.7 % in two weeks of dry work in Bourdas and Geladas (2024, PMID 37797907). It will still be there for you in a fortnight; there is no rush.
Apnea walk interval timer
Set your walk and hold segments, then let the timer call the phases. Soft ground, no traffic, never near water.
Safety: this one has real failure modes
Apnea walking has a specific hazard that static training does not — you are upright and moving when hypoxia hits. A blackout while walking means falling onto whatever is underneath you.
- Soft, flat ground only. Grass or a running track. Never concrete, never stairs.
- Never near traffic, never near water. Not by a canal, not on a pier, not on a beach path.
- Never with headphones in, never in the dark.
- Tell someone, or bring a buddy. A buddy who understands what a blackout looks like is worth more than any timer.
- Stop the session at the first sign of dizziness, tunnel vision, tingling lips or loss of coordination. Sit down first, breathe second.
- Do not combine with maximum static attempts on the same day.
If any of that sounds excessive, note that these are the same precautions the spearfishing and freediving instructor communities publish for dry walks, and they exist because people have been hurt.
Fitting it into a training week
Apnea walks complement tables rather than replacing them. A workable pattern:
| Day | Session |
|---|---|
| Mon | CO₂ table, 8 rounds, dry static |
| Tue | Apnea walk, 8 rounds — first-contraction stops |
| Wed | Rest or easy aerobic work, no breath holds |
| Thu | CO₂ table, 8 rounds |
| Fri | Apnea walk, 8 rounds — a little deeper into the struggle phase |
| Sat | Long easy walk, relaxed nasal breathing only |
| Sun | Full rest |
Every second week, replace one session with a baseline re-test and adjust your table hold accordingly. A fortnight is the right interval because that is the timescale on which the measured changes show up — in beginners, 13 days of daily holds raised total apnea time by 70 % (O’Croinin et al., 2025, DOI 10.1139/apnm-2025-0033). For example, if your baseline moves from 1:10 to 1:25, your table hold moves from roughly 0:40 to 0:48 and the whole week rescales with it.
Combining walks with static tables
The two stimuli are complementary:
- A static table is a set of breath holds taken sitting or lying still, and it trains tolerance at rest, where relaxation and heart-rate control dominate. It is the safest place to push deep into the struggle phase.
- Apnea walks train tolerance under a metabolic load and teach you to keep a stable stride and relaxed shoulders while an alarm is ringing — which is exactly the skill a diver needs on the way back up. The same load logic is why runners use CO₂ work , with a rather more sober set of expectations.
If you only have time for one, do tables. If you have a dog, a commute or a lunch break, do walks — the barrier to entry is close to zero, and the meta-analysis by Massini et al. (2022) found that pure breath-hold work, physical training and cross-training all improved static apnea time, with a large pooled effect (Hedges g = 1.30).
Sources
- Massini, D. A. et al. (2022). Journal of Sports Medicine and Physical Fitness 62. PROSPERO CRD42021230322.
- Bourdas, D. I. & Geladas, N. D. (2024). Respiratory Physiology & Neurobiology 319:104168. PMID 37797907
- O’Croinin, O. et al. (2025). Applied Physiology, Nutrition, and Metabolism. DOI 10.1139/apnm-2025-0033
- Stanley, N. N. et al. (1975). Evaluation of breath holding in hypercapnia as a simple clinical test of respiratory chemosensitivity. Thorax 30(3):337–343. PMID 1145539
Every source above links to its abstract, and each link was opened and re-read against this text during the last editorial pass. Where a study measured trained athletes rather than beginners, for example, the article says so instead of generalising.
Written by Jan Luther — keen amateur freediver, and the developer behind Apnea Trainer since 2010. About this blog explains how sources are chosen; the imprint has the contact details for corrections. All articles
Frequently asked
How long should an apnea walk hold be?
Long enough to reach firm contractions, which on the move usually means 20 to 40 seconds rather than the minute or more a static hold needs. Beginners should stop at the very first contraction for the first two weeks and build the pacing habit before the tolerance.
Are apnea walks more dangerous than static holds?
They carry a different risk. Oxygen is consumed faster while walking, so the margin between uncomfortable and hypoxic is narrower, and you are upright when it happens. Soft flat ground, no traffic, no water nearby, no headphones, and somebody who knows what you are doing.
How many apnea walks per week?
Two sessions a week alongside two CO₂ tables works well, with at least one full rest day. They complement each other — tables train tolerance at rest, walks train it under a metabolic load.
Can I do apnea walks instead of CO₂ tables?
You can, and the meta-analysis by Massini et al. (2022) found that pure breath-hold work, physical training and cross-training all improved static apnea time. If you only have time for one, tables are the safer place to push deep into the struggle phase.
Apnea Trainer is a breath-hold training app for iPhone, Apple Watch and Android. It guides you through timed breathing cycles and builds progressive tables around your personal bests. On Apple Watch the whole session runs on your wrist — live heart rate and haptic cues for every phase.
Keep reading
CO₂ Tables Explained: The Science of Training Your Urge to Breathe
The urge to breathe is a CO₂ alarm, not an oxygen alarm. Here is how CO₂ tables train that alarm — and how to build one from your current max.
Breath-Hold Training for Spearfishing: A Beginner's Dry-Training Plan
You need less bottom time than you think — and CO₂ tolerance, not lung volume, is what is holding it back. A full six-week dry plan.