this article is gold, must research more into Canova:
"A Kenyan runner's mentality is to run at the right speed," says Canova's assistant in Iten, Kenya. "The Western runner's mentality is to run the right distance. I'm not necessarily saying one is better than another, but that's just how the mind-set works."
"EXTENSIVE WORKOUTS REQUIRE LONG REST PERIODS AND NO SCHEDULE"
"It's also important to note that even professional U.S. runners who joined the American Distance Project (an organization co-coached by Canova and Scott Simmons) needed a period of adjustment. "My realization was that with a lot of our athletes, we hadn't finished building their aerobic house," says Simmons. "We looked at their [past] training and felt that they were never 100 percent prepared for their performances. When they had success it was because they were 75 percent prepared, 100 percent motivated, and 100 percent talented. So we had 25 percent to work on."
"This gives way to the main philosophic tenet, which I've dubbed Canova's Golden Rule. Simply put, to fulfill your potential as a marathoner, you need to progressively extend the distance you can run your goal pace, over a period of months and years."
https://www.runnersworld.com/race-training/canova-101
