Free guided breathwork
CO₂ Tolerance — Level 1
Train your body to tolerate higher CO₂. Better endurance follows.
4-0-6-88 minButeykointermediate
Inhale4s
9:00 leftMuted preview
How to practice
4-0-6-8 breathing
CO₂ tolerance correlates strongly with VO₂max in trained athletes.
Sit comfortably, breathe through the nose when possible, and keep the effort gentle. Stop if you feel dizzy. Do not practice intense breath holds near water or while driving.
Related free sessions
Performance
6-6-6-6
Lung Capacity Builder
Strengthen the diaphragm. Expand maximum vital capacity over weeks.
Box
Performance
4-0-6-12
CO₂ Tolerance — Level 2
A harder progression on CO₂ tolerance.
Buteyko
Performance
3 rounds x 35 breaths
Breath Hold Builder
A WHM variation tuned for max retention progress.
Wim Hof