Interesting. CCrunner609 is saying I was born with a "huge aerobic engine" and therefore could train anyway I wanted and be somewhat successful. Do you think I was born that way? I remember training on my high school track in 1964 as I stopped off to see my parents in Ohio. My brother went with me and sat in the stands. As I trained two teenagers came by and my brother heard them say. "If I had legs like that I could run fast too."
First let me say I have never trained anyone the same way I trained. First, it is very difficult but truthfully I liked doing the workouts. For the years I have been coaching (since 1966)most of my athletes have done "effort interval" (that is what I call it) three or four workouts a week. For instance Eamon O'Reilly did a long run every morning. (7-9 miles) and then was with me in the afternoon. Three to four were hard workouts with the other relaxed intervals. (For those who don't know, Eamon came from Georgetown to train with me in California and six months later ran his first marathon in 2:16 running by himself the entire way. He was very talented.)(Then 2:11 at Boston in 1971)(No I was not training him)
As far as Jack Daniels test, it probably wasn't as accurate as it could have been. Not that he did anything wrong but prior to the test I had minor surgery and lost a lot of blood every day through the final trial.( I didn't tell him) I had a glucose tolerance test taken a week to ten days before the race and the results were very poor. (By the way I will send that online book to anyone who wishes to read it. Send me an email which is on my web site,bobschul.net and I will email it to you. It covers a four year span starting after the Games.)
I think I remember someone saying a system similar to Igloi's was in the early 1900's. Actually Igloi and his athletes (3 of them) in Hungary held all the flat distance world records from 1500 to 10K in the middle nineteen fifties. The L.A. Track club held all the american records in flat distances from 1500 through 10K.
Those who say we have learned much since the 60's are right. I read various journals (or did) and still do a little coaching. I find every athlete is different and therefore I don't train everyone the same. Same theory but I try to match their mental to the physical. Some people like short intervals and others prefer longer. I have done mile repeats with my cross country kids.
Anyway I believe it is the time spent in a workout, keeping the heart rate above 70% of max, that places stress on the body and therefore workouts take time. If I was training in todays world I would stress my internal system four to five hours a day. Some of that time would be running but since pounding too much would bring injury, I would use the pool ( I use it now with some athletes) and the bike, treadmill etc.
Working amateurs could not do that.