Derek Clayton 6'2" wt 160lbs started racing in 1962 at 19.
Training ) Identical year aound) M AM 5 - 7 miles "easy"
PM 17 miles fast
Tu am 5 - 7 miles PM 12 miles medium
W am 5 - 7 miles PM 14 miles fast over hilly terrain
Th am 5 - 7 miles pm 14 miles fast over hilly course
Fr am 5 - 7 pm 10 miles easy
Sa am 4 miles PM 25 miles in about 2:20 once or twice a month runs xc or road race instead of Sa pm workout.
Su am 17 - 20 miles in hills PM 10 miles medium pace.
Clayton felt his track times would have been fsster if not for injuries.
"My training is mainly based on how I feel - no prearranged schedule. When training for a marathon I train long and hard. Due to my severe training, I have had many injuries,three of which put me in the hospital! The first operation I had three years ago was for a damaged achilles tendon. The second, 14 months ago was for the removal of my right lateral cartilage. The third December 1969, was for the removal of my right medial cartilage.
/ my note surgery back then was much different then now the whole thing was usually removed, MD's thought the cartilage was a vestigial ie nonfunctional structure./
I cannot foresee marathon times getting much below 2:10 because the training necessary to reach this standard requires miles and miles of fast running on the roads, ( perhaps shoe technology has made a difference)thereby incapacitating the athletes sooner or later through injury.
Best marks marathon 2:08:33.6 35K 1:46:11 20 miles 1:39:02, 30K 1:30:32, 25K 1:15:11 15 mile 72:04 10miles 48:18.6 10K 28:45 6 miles 27:48 5K 13:49.6 3 miles 13:24.4 3K 8:06.6 2 miles 8:37 1500 3:51.8 1 mile 4:07.6 880 1:56.7 440 52.8
Source How They Train 2nd edition