Tell me more. Lol. I just did a 10k run, I tracked it with my watch but tell me how any of that matters to anyone except me (and it doesn't even matter to me what my HR was over that run - though i did use a HRM but mainly to keep myself from over-exertion). I really don't understand what fitness apps are supposed to do, they're possibly the most useless thing ever invented. I wrote my own app in Clojure over a decade ago and used it to track my workouts for a year or two, I never ever go back and look at a workout more than a week ago, maybe 2 weeks at the most, it simply isn't good data, it is the least valuable data one can generate.