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I tend to do % of heart rate reserve [HRR]
https://runandbeyond.com/karvonen-heart-rate/
My resting is around 40, max is around 175.
So reserve is max - restingZone 1 could be up to resting + 60% of hrr, I.e. 0-121 (40+135*0.6)
Then 60-70% for zone 2, so 122-135
EtcThere are a handful of ways to pick zones, but I've found that seems to make sense for me when you have slightly lower or higher rates than normal
duncs
@Chalfie
Heart rates.
How do I calculate zones when I've got a lower heart rate because genetics.