What Apple offers, by way of the Apple Watch, is an estimation of VO2 Max (read: Cardio Fitness), which is generated by way of Apple’s internal calculation run on your sex, height, age, and cardio performance during any outdoor walk, run, or hike activity. By using your body metrics and juxtaposing those values against your GPS-tracked speed, Cardio Fitness provides an estimate of your VO2 Max.
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