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Breath-hold timer

Breath-hold timer

A free, no-account taste of the app. Pick a mode, breathe up, and hold. The app adds voice guidance, contraction tracking, and saved progress.

Base Personal Best

Scales all table holds and recoveries to your actual capacity

Tap to start

Relax your shoulders, breathe slowly, and prepare

CO₂ table

Round
Breath hold
Recovery
1
0:45
2:00
2
0:45
1:45
3
0:45
1:30
4
0:45
1:15
5
0:45
1:00
6
0:45
0:45
7
0:45
0:30
8
0:45
—

Want a structured training plan?

Build a custom multi-week CO₂ and O₂ training program tailored to your personal best, with rest days and progress tracking.