Science-based guides on breath-hold training: CO₂ tables, dry apnea training, freediving and breathwork — with free interactive tools.https://www.apnea-trainer.com/enhttps://www.apnea-trainer.com/blog/o2-tables-vs-co2-tables/https://www.apnea-trainer.com/blog/o2-tables-vs-co2-tables/One table shrinks the rest, the other grows the hold. Same goal, opposite mechanics — and a very different risk profile. Here is how to tell them apart and when to use each.Fri, 07 Aug 2026 00:00:00 GMTO2 vs CO2 tablesoxygen tables freedivingdifference CO2 O2 table apneaO2 table freedivinghttps://www.apnea-trainer.com/blog/breath-training-for-runners/https://www.apnea-trainer.com/blog/breath-training-for-runners/Breath work is a lever on CO₂ tolerance, breathing economy and comfort — not on your VO₂max ceiling. What the runner studies really show, plus a dry protocol.Fri, 31 Jul 2026 00:00:00 GMTbreath training for runnersCO2 tolerance runningnasal breathing runningbreathing exercises endurancehttps://www.apnea-trainer.com/blog/bolt-score-co2-tolerance-test/https://www.apnea-trainer.com/blog/bolt-score-co2-tolerance-test/A myth-check of the BOLT score: a genuinely useful personal signal of CO₂ tolerance — but not the validated performance predictor the "40-second ideal" makes it sound like.Fri, 24 Jul 2026 00:00:00 GMTBOLT score testCO2 tolerance testwhat is a good BOLT scorehow to measure CO2 toleranceBOLT score 20 secondshttps://www.apnea-trainer.com/blog/breath-hold-baseline-test/https://www.apnea-trainer.com/blog/breath-hold-baseline-test/Before you train, measure. A guided dry test — paced breathing, one relaxed max hold — and an honest reading of what your result means.Tue, 21 Jul 2026 00:00:00 GMTbreath hold testhow long can I hold my breathapnea training at homebreath hold baselinehttps://www.apnea-trainer.com/blog/kumbhaka-breath-retention-freediving/https://www.apnea-trainer.com/blog/kumbhaka-breath-retention-freediving/Pranayama’s retention and a freediver’s CO₂ table are the same mechanism in different vocabularies. What holds up under measurement — and what does not.Sat, 18 Jul 2026 00:00:00 GMTkumbhaka breath retentionpranayama breath holdbreath retention benefitsantara kumbhakahttps://www.apnea-trainer.com/blog/breath-hold-training-spearfishing/https://www.apnea-trainer.com/blog/breath-hold-training-spearfishing/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.Fri, 10 Jul 2026 00:00:00 GMTbreath hold training for spearfishinghow to hold your breath longer spearfishingspearfishing bottom timefreediving dry traininghttps://www.apnea-trainer.com/blog/apnea-walks-dry-co2-training/https://www.apnea-trainer.com/blog/apnea-walks-dry-co2-training/Movement makes CO₂ faster. Apnea walks turn that into the most time-efficient dry tolerance session there is — with a configurable interval timer.Sat, 20 Jun 2026 00:00:00 GMTapnea walkapnea walkingdry static trainingCO2 training without waterhttps://www.apnea-trainer.com/blog/breath-hold-training-science/https://www.apnea-trainer.com/blog/breath-hold-training-science/Four peer-reviewed studies, no hype: what breath-hold training actually changes, how fast, and which popular claims the measurements refuse to back.Wed, 10 Jun 2026 00:00:00 GMTbreath hold training sciencedoes apnea training workapnea training resultsfreediving researchhttps://www.apnea-trainer.com/blog/co2-tables-explained/https://www.apnea-trainer.com/blog/co2-tables-explained/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.Thu, 14 May 2026 00:00:00 GMTCO2 tablesCO2 tolerance traininghow to train CO2 tolerancebreath hold training