Not sure how accurate watch-based VO2 Max really is, but before getting the Hydrow, it said my VO2 Max was 38.5, giving me a "fitness age" of 42. I'm 40. After using
What is VO2 max? | Hodinky-365.com
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VO2 Max Accuracy in Smartwatches TESTED! (Apple Watch, Garmin, Polar, COROS, Suunto, and More!) - YouTube
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Suunto Ambit3 Sport - Features - Running performance level