Living in the Past wrote:
What's intriguing about Clayton is that the interval work might have actually helped him build a base for the marathon, even though most people would consider that to be the wrong way to go about it. Could it be that if you're genetically talented for the marathon, you'll improve in that event even though your training is geared for the mile?
Yes, I think it could lay the foundation for the marathon. Coincidentally, Clarke also ran a lot of interval work early in his career--under Stampfl, IIRC?
And at a somewhat lower level: Joe Henderson, purveyor of LSD running, did years of interval work. He finally said "the hell with this" (sore legs, injury, etc.) and started running longer and slower (NB: *not* as long and particularly not as slow as later on). He ran a marathon fairly soon after making his switch to longer/slower. What was his fastest marathon? That very first one. After doing everything "right" in later years ("right," in terms of the message he was delivering), he never ran the marathon as fast again. Hmmm....
Also, pretty sure Clarke's first world record was the 6mile/10k, around 1963. I'm thinking the latter was 28:15.6, but I could be dead wrong--I've got his delightful autobiography ("The Unforgiving Minute") in storage. He gives a great account of the race, which he basically started at "Lindgren pace," then managed to hold on.