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@Smallfurry
But Threshold HR is the max you can hold for 60 minutes. Even then its theory. If you actually can hold it for 60mins. You're the suffer king.
So holding Your 60 min max for 173 mins is always going to make Strava go mental.
HR max isnt going to change. Other than decrease With age. But the amount of it you can tollerate can be trained, as well the effectivity of each beat. My FTHR was around 158 a few years back when I had become a bit lazy. Its been calculated as 168 recently (ouchie).