The blog
VO2 Max & Endurance
What VO2 max actually measures, how accurate your watch's estimate really is, and what a good number looks like by age and sex — the evidence behind endurance performance over a lifetime.
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Can Wearables Accurately Estimate VO2 Max?
Apple Watch and Garmin VO2 max estimates carry real error, several points in either direction. Here's what recent validation studies found, and how to read your number.
Martin · -
What Is a Good VO2 Max for My Age and Sex?
What counts as a good VO2 max depends on your age and sex. Here are the reference ranges, what the number really tells you, and why your own trend matters more.
Martin ·
Astrea estimates your VO2 max from your own training history and tracks how it moves over time, instead of handing you one noisy number.