Breath hold timer
A free breath hold timer using CO₂ intervals — relaxed holds with shrinking recovery between them. Read the safety notes before you start.
Ready
Press start. Nothing to install, no account.
CO₂ Intervals · about 6:13 · free, no signup, nothing to install
Before you use this. Breath holding can make you faint. Never in or near water, never while driving, and always sitting or lying down. Read the safety guidance.
Normal breathing — no hyperventilation — then a comfortable hold, repeated with less recovery each round. It trains tolerance of the urge to breathe rather than maximum hold time, which is the point: the urge is the thing you are learning to sit with.
Never do this in or near water, and never while driving. Sit or lie down somewhere you cannot fall. Breath holding can make you faint, and a hold that feels comfortable is not evidence that it is safe.
The same thing, on your phone
ALISI runs this and five other techniques offline, with haptics so you can close your eyes, and keeps a record of what you have done.
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