📚 Guides
Guides
Short, sourced explainers to help you test well, read your numbers honestly and pick the right tools.
⌚ Guide
How accurate is your watch's VO2 max estimate?
What the validation studies found for Garmin, Apple Watch, Polar, COROS and WHOOP, and how to get a steadier number.
🏅 GuideBest watches for tracking VO2 max after 40
A plain-English comparison of Garmin, Polar, COROS and Apple Watch models that estimate VO2 max, and which suits walkers vs. runners.