Practice — Timer
CO₂ Session
Run multiple holds in one session. CO₂ rises across rounds — watch your holds change as it does. Log the whole session when done.
Never hold in water, while driving, or anywhere you could fall. Dizzy or panicky — stop and breathe normally. First reflex is the signal; stop there.
Round
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Last
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Best
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Session
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This session
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Space start/stop R reset round S save session
Life Circuit