gregmacd wrote:
7:30 mpm or slower.
I spent a weekend with some Kenyan runners who were training in the US to pick up prize money. They were more in the 2:10 - 2:20 range, so maybe more sub-elite rather than elite. They would run hard in the morning, but do an easy 4 mile run at night. They would start the 4-mile run by walking a block or two, and then go into a slow 13 mpm. They would gradually pickup the pace until they were at about 7:30 mpm at the end of the run.
Yep. Pretty much this. Easy miles don't need to be hard, and most do them way to fast. This is 13:30 types going almost 50% slower by pace.
That's like 50%-70% slower. Which would be like a 17:30 guy doing 8:30+. Or a 15:30 guy doing 7:30+.
You get all the aerobic stimulus whether you run hard easy or slow easy. You recover much better and can do much more aerobic volume when you do easy days at 60-70% of HR max rather than the typical 70-75% people do to maintain their ego.
You only need to look at what the world class guys are doing to confirm this. Kipchoge isnt out doing bulk mileage at 5:30 or even 6:00 pace. As are none of the aerobic guys mile and up.
Go look at Seilers research as well. He does incredible physiology studies characterizing elite training, and then how well it scales down to sub elite and hobbyist level. He is consistently finding that scaled down elite training works, and consistently finding that doing those easy efforts very relaxed, well below 70% HRmax, is where the elites and those under them having the mose success are working.