There is no formula that is more useful than monitoring your own HR in conjunction to your perceived exertion - ie, very easy, easy, somewhat hard, hard, and "i'm at my limit!" Don't be a slave to HR!
You are born with your own maxHR - it is not a trainable number, and it hasn't much to do with one's level of fitness (or potential). Threshold HR is trainable - but it's also effected by sleep, wellness, caffein, etc.
There must be past threads here about this - I know there are many who know more than I.




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