[WIP] Heart rate zone tracker#2383

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Andersama wants to merge 1 commit intoInfiniTimeOrg:mainfrom

Andersama:heart_rate_zone_tracker

Commits on Dec 25, 2025

Categorizes time spent in five heart rate ranges. These are calculated relative to a set max heart rate estimated by age corresponding to 50% (zone 1), 60% (zone 2), 70% (zone 3), 80% (zone 4) and …
Andersama
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