Hi, thanks for the link, was an interesting read. AnT is somewhere over 170; Its hard to get a decent updated number as there isn’t a mountain (hill) accessible to me during lockdown that I can’t get up easily in under 20 minutes so haven’t been able to do a test I’m willing to rely on.
I use a chest strap and am a pretty experienced runner/hiker and have no issues running at a fair enough pace on flat and gently rolling terrain. I’m certain that part of the problem is that in Scotland the mountains are pretty small, so it’s easy to hike up them near AnT and hence I’m pretty sure I’ve trained myself to do that instead of using the aerobic pathways.