The Holts were identical twins, to my knowledge (If I'm wrong, maybe one of you Brits. could correct me).
Ok - so identical twins have the same genetics and potential. Dave ran an extra 20-25 miles a week (because he always ran a 5 miler at lunchtime) compared with Bob, who was a "once a day man."
Yet- Bob was faster than Dave in every event from 1500 - to the Marathon....but not by much (Dave had a few seconds faster than Bob in the 10 miles).
So one of my points is that once you do a certain level of training, and you find that to be a good one for you, tacking on more miles will not necessarily make you improve. With some it does - with others (like Bob) it does not reap dividends.
The extra 20-25 a week Dave ran, did not help him run faster than Bob.....
You might have thought that the extra mileage would have given Dave a psychological boost....but that did not take place either.
One can surmise, therefore, that Bob had a higher pain threshold and tolerance compared with Dave, resulting in better results for Bob.
When you get to a certain level, the psychological part is so important.
We have all seen runners who can do great sessions on the track with the best athletes, but when it comes to the race on the weekend, they finish minutes behind.....
You are right about the world of work changing and becoming more stressful, but it does not have to be like this.
When living in London a few years ago, I used to bump into Dave Taylor (Herne Hill/Blackheath) rushing to work on the "tube" (subway). He had a full day at work, and would do a three mile run at lunchtime in Battersea Park.
Despite this hectic schedule and a fulltime job with a lot of responsibility, Dave has run 13:53 for 5000 as a 42 year old last year!
So even with long days at work, the times can be achieved. Running has a huge advantage over other sports in that most of the training is done at considerably lower than maximum pace and intensity. In other words - you can achieve very high results by only doing about 10/15% of your training at high intensities and qualities.
So, for example, people often have the advantage of being able to do the bulk of their training by running to and from work. Or running at lunchtime during their lunchbreaks.
It's a question of organization and regularity.
The overall standards in Britain were much higher when I used to run for Hercules Wimbledon. I used to run in the 52-54 minutes range for 10 miles and did 1:50.49 in the Finchley 20 (April, 1978) - but at the time I was considered nothing more than a useful "scrubber" in the club. These days - the times I ran win many races in Britain....and quite frankly I cannot fathom why the quality has diminished this much?
Flashback to another idol of mine - Dave Clarke. He was also a clubmate at Hercules Wimbledon. Dave ran 27:56 for 10.000 track in Florence, Italy (I think it was in 1978...but not sure..) and his training was pretty simple. He used to do a "3" in the morning (He lived on Magdalen road, Earlsfield). Then breakfast. Then off to Borough road college. His evening training was usually a "7 miler." He did most of his "sessions" in Richmond Park....doing things like repeat "1000's" on grass......
Dave Clarke then went on to run higher mileage.....and we all know what a great cross country runner he became. He even ran a 3:39 for 1500 and a 3:56 mile, which was significant, because Dave, by his own admission, was not a pure speed runner.
Also interesting to note was that running was not the first love of Dave in sports. He used to play rugby and cricket (he went to a Private school), and once told me that his lifelong ambition would have been to play cricket for England.
I recall Dave in some of the world cross country championships - in which he has finished in the top 15 on a few occasions. He would try so hard in those races, against the Africans, that it would bring tears to my eyes. An incredibly brave runner....blessed with phenomenal cross country strength....not a "natural" track runner, you might say...but still achieved very commendable times - 13;22/5000, 27:56/10.000. Dave also ran his debut marathon in Chicago (2:15), and then went on to win the Stockholm Marathon (2:13) toward the end of his career.....
He was pretty tall (like Alan Culpepper) and perhaps did not have the efficient biomechanics to run a super marathon time (2:08/2:09).
Forgive me for my digressions - but those were my heroes....and they still are.
Sorry to sound cynical...but these days when one sees fast times being achieved by certain people, one wonders whether they were really achieved legally. One cannot help to think that way.....and it has damaged the sport a lot....the drug issue, that is.