I agree I would not to do 80 x 400 on the track. That is why I stopped at 20, since I was becoming mentally bored. I did surmise what I might have done it I had continued at the same pace instead of running the 20th in :54. I believe I could have gone on for another five or six but I doubt I would have run :54 on the last one.
Going to extremely long workouts were a problem in the sixties since we were working an eight hour job in between workouts. I have thought what might or could have happened if those athletes of the 60's would not have had to work or even go to college. In todays world there are massage therapists, chiropractors and doctors who have the knowledge to keep a body from injury or if it becomes injured the knowledge to fix it.
As far as the word interval, I have had many people believe I did everything hard or very hard. Obviously from what I have said that was not the case. There were hard days and medium days and easy days and they revolved around the speed I would doing a paricular set and the distance involved in the set. The true interval, I thought was started by the English and they timed everything. Igloi worked on effort and only 400's and above were timed, again so we would learn the proper tempo for a race.That is why I use the term "effort interval" in my training book. I suppose I term the entire workout Interval training or effort interval training. I didn't ask Igloi,"What type of training are we doing now?"
Igloi jogged all of his intervals between runs and when I trained myself, starting in August of 1963 I soon began to walk intervals and shorten them. I found the walk allowed the leg muscles to relax and I could do more extended workouts.
My walk periods never were very long for I would up the speed, if that is what I wanted, as my body progressed to a different level. There were times when I would do 300 meters in approximately :45 to :47 with a twenty yard walk between each one. Other times while doing fat 200's in :24 to :25 (based on my knowledgeof my body and not a atop-watch) I might give myself a fifty yard walk. The amount would depend on what I had done previously and how I felt. I never made a workout up before hand but only knew if it was an easy, medium, hard or very hard day. Each set was built on the previous one and I made a determination of the amount and speed and walk interval based on how I felt at that time and how hard I wanted to push my body. By the way, in a hard day, not every set in the workout was hard. I doubt I went into another hard set after just finishing one. I have done the same thing with my athletes over the past forty years if they are at the workout. I do help some people over the phone, which I do not like, since I cannot see them.