Gladly, and congrats!! Specifically I was referring to the fact that your average HR can be with in range for the entire run, but if the last 2-3 miles were in Zone 3 was it really easy? That typically happens more in the heat due to accumulated heat.
As for easy miles, I say that almost every runner struggles with it at some point. I read somewhere that we generally like to self select zone 3, so to start just go slower than what feels slow lol. I also, remind my self of the purpose of the run before I head out. There are 0 gains being made running slightly harder than easy, and the harder you go the more damage you do to your quality days. On the other side, there really is no negative to running slower on those runs. Lastly slow running keeps you healthy, slower equals shorter more stable levers... once you have the feel and the motivation to run slow, it gets much easier! Hope that helps!