My impression of Moorcroft's training is that he hardly ever did tempo runs and that the repeat 1000s at faster than 3000 pace (yes that's correct) with long rests were key. I'm not aware of anyone else doing 5 x 1000 under 2:30 in the late 1970s or early 1980s.
To Renato, Antonio, and others:
I agree that long intervals are the key to the improvement in middle and long distance performances. Here is a paper by a swim guy (Rushall) that claims that short intervals with short rests are the best training for swimmers. He claims that Astrand's work in the 1960s proved that long intervals were not good, yet he cautions against extrapolating swim training results to other sports.
I remember Renato also talking about the training of an 800 guy (Longo) with a particular workout of 150s a little slower than 800 race pace with rest periods of about 30 seconds. The Kenyan diagonals workout (also used by Bungei, 2008 Olympic champion) seems to be another short interval/short rest workout. Renato also talked about Juantorena and Aouita doing 1200s as 150 hard/50 easy continuous x 6.
My questions are as follows: Why would long intervals be good for runners but bad for swimmers? Or is Rushall incorrect? What is the role of short interval/short rest training in the modern middle distance runner's program?
Link to the paper: