Whoop is famous for identifying illnesses (such as COVID) early on by respiratory rate. Bevel has the data too.
Extension: A dedicated “sick mode.” If your temperature and respiration rate differ at night, the app should ask you in the morning, “Are you feeling sick?”
The result: If you say “yes,” all training goals are paused, the streaks (training days in a row) are frozen and the focus changes completely to “hydration & sleep.” Nothing is more demotivating than a fitness app that makes you feel guilty when you have the flu.
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