WEBVTT

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Your watch gives you a VO₂max number.

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It's an estimate.

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Checked against lab tests, watch estimates are often off by 5 to 10%.

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They tend to read high if you're less fit, and low if you're very fit.

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Two people can see the same number, and have very different engines.

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Training zones are often worse.

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Many still start from 220 minus your age,

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a formula that's typically off
by about a dozen beats a minute.

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Your real thresholds aren't in your pulse.

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They're in your breath:

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the points where carbon dioxide breaks away from oxygen.

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Measuring breath has meant a lab.

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A cart, a booking, a hose to the wall.

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So most people never test, and athletes rarely test in their own sport.

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And fitness matters beyond sport.

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In a study of more than 120,000
patients, low fitness was linked

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to higher mortality, as strongly
as smoking or diabetes.

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VenTracer puts the breath measurement on the mask.

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Oxygen and carbon dioxide, every breath, wherever you train.

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And we'll prove it against a lab cart before we claim a number.

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VenTracer.