What is your AnT?
You might find this discussion helpful –
First off, thanks for such a fantastic resource for training – it’s been a great help last couple of years.
I have finally got a HR monitor and determined my AeT to be somewhere around 145. Almost all of my training is done below this threshold to build endurance and I can hold a steady pace and HR on flat ground. However whenever I start heading uphill my HR spikes wildly up to 160+, in order to keep it low I am reduced to walking uphill almost comically slow. I have even been overtaken by lovely old ladies walking their dogs, making for amusing conversation. I have resigned myself to the fate of slow uphills for the foreseeable future (my approach with mountain running has always been walk early, walk often), but I am curious as to what would be the most efficient way to overcome it: should I be erring towards the borders of z1/2 or should I be ‘redlining’ it and trying to keep as close to my AeT as is possible?