[sdimitris]

Cardio fitness is an established predictor of mortality and longevity, but testing it requires a proper maximal-exercise treadmill test that one needs to reach their maximum heart rate (costly & potentially risky).

Modern wearables can estimate VO2max but they require some sort of workout data, potentially excluding the majority of the population (=sedentary people). Our recent research at the University of Cambridge developed and validated one of the first models for non-workout VO2max estimation. Paper: https://www.nature.com/articles/s41746-022-00719-1

TLDR: we can now estimate cardio-fitness just by tracking your everyday movement/heart rate