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
Technique
Lung & Diaphragm Stretching for Freediving: What Actually Improves
You cannot stretch your lungs bigger. What you can train is ribcage and diaphragm flexibility — and that changes how a breath hold feels. A dry, guided routine.
10 min read
Science
The Mammalian Dive Reflex: How Cold Water on Your Face Slows Your Pulse
Cold water on the face genuinely slows your heart through the vagus nerve. Here is the real physiology, how freedivers use it, and where the wellness claims outrun the evidence.
8 min read
Training
O₂ Tables vs CO₂ Tables: The Difference, Simply Explained
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.
9 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