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Yeah, I should do that.
I have just been letting Garmin suggest a run type and it's corresponding HR range. I assumed that this was based on my HR zones but it is not, it is based on something more complex.
I have also compared my zones when auto calculated by Garmin based on max HR and HR reserve. They are totally different, but the hrr zones make more sense to me.
Big picture is that it is doing what I need it to do currently, and that is forcing me to run slowly, build miles and think about my form. I think I'm learning about more about controlling effort too.
I don't really like hr training so as soon as I'm feeling confident that my legs can hack running at a pace I enjoy running at I'll ditch it and do slow runs on feels.
It's been so long since I've paced easy runs by anything other than perceived effort, so I'm not sure of the exact answer, but...
If it were me, I would go out and smash a parkrun (or other 5k effort) which will (a) give you an actual 5k time to go off and (b) might record a new max HR. Perhaps the suggested easy run paces will start to converge?