
A popular smartwatch and fitness tracker that offers comprehensive health monitoring, including estimation of cardiorespiratory fitness (VO2 max) by tracking distance and heart rate during physical activity.
if you wear like an Apple watch or some sort of fitness tracker what they do is which is you know it's looking at the distance that you run and the amount of time it takes
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"The transcript explicitly mentions the Apple Watch as a specific fitness tracker used to calculate and estimate VO2 max based on running distance and time."