Training Featured
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.
7 min read
Training
Breath Training for Runners: CO₂ Tolerance for More Endurance (An Honest Guide)
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.
8 min read
Science
The BOLT Score: What This CO₂ Tolerance Test Really Tells You (and What It Doesn't)
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.
8 min read
Training
Find Your Breath-Hold Baseline: A Free Interactive Test (No Water Needed)
Before you train, measure. A guided dry test — paced breathing, one relaxed max hold — and an honest reading of what your result means.
6 min read
Breathwork
Kumbhaka: What Yogic Breath Retention and Freediving Have in Common
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.
7 min read
Technique
Apnea Walks: The Dry CO₂ Training You Can Do Anywhere
Movement makes CO₂ faster. Apnea walks turn that into the most time-efficient dry tolerance session there is — with a configurable interval timer.
6 min read
Science
What Science Says About Breath-Hold Training: 4 Studies in Plain English
Four peer-reviewed studies, no hype: what breath-hold training actually changes, how fast, and which popular claims the measurements refuse to back.
6 min read
Training
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.
9 min read