There is one other variable related to easy pace that I have discovered through my own training. The complexity of the development of a runner affects easy pace relative to speed. In other words, take the current version of myself, at my fastest which is a 1:05 half marathoner in 2019, vs a couple of older versions of myself(let's say when I was a 1:16 half marathoner in 2004, and a 1:10 half marathoner in 2011). During my training around 2004, I would say that my easy pace runs were not as much of a range as they are now. I think a lot of them were something like 7:00-8:00 miles. Now, that range has shifted to a much wider expansion of around 6:00-10:00 miles. But also, I run higher mileage now-so you have to factor that in too. While I have gotten faster at racing because of consistency, higher mileage, and faster workouts, I have also gotten better at running slower. If you want to get faster, don't just practice running faster; practice running slower too! Several Kenyans I have talked to told me how easy they run sometimes(yes 10:00 miles). But when they go to work, they get serious about running 4:00-5:00 pace. While the Kenyans are the world's fastest distance runners, they probably are also the best at running a huge range of paces.
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