Here is my data - I used the Wiki how calculator for my V0 max initially which gave me 165 - Then looked at some prior fit-bit readings. I revised it up to 175 because I had very decent looking evidence from fit-bit showing some 175 plus figures
I am just starting to use the running for fitness heart rate zone calculator - See attached spreadsheet
At the moment The largest proportion of my running is currently in between Z2 and Z3 - I know I need to explore some Z4
Currently I am averaging 134-136 bpm for three x nine minute miles on a flat course
I really need running watch now - The fit-bit and mapmyrun combo is a good start but makes it a little difficult to sort out my “in run” progress on pace and HR
FYI I have just subscribed to the white Horse 1/2 Marathon in early April 2018.
My limited understanding is that about 75% of activities should be in aerobic and 25% anaerobic.
Even factoring in the age difference It looks to me as if I have a much more cautious approach than Nam ?