Ok, so let me try to make my point clearer by taking specific post extracts.
For instance, CANOVA has written the following, talking about the training of top athletes for a 800m race :
"
Once again, the answer depends on the typology of the athlete, not on the event.
Nixon was a type of athlete, such as Paul Ereng, Alberto Juantorena, Marcello Fiasconaro, Luciano Susanj, Tom Courtney, Bill Crothers (the best competitor of Peter Snell), Billy Konchellah and many other, having the attitude of a 400m runner, with a high percentage of fast fibers. Of course, for this type of athletes, THE MOST IMPORTANT THING IS TO ENHANCE THEIR LACTIC ABILITY, and only in a second time, maintaining the ability in producing lactate, they can try to enhance their LT.
So, OPPOSITE TO WHAT LYDIARD SAID, ANAEROBIC FIRST (Because is their main quality), and AEROBIC SECOND.
But, if we speak about other runners RESISTANT TYPE (like all the athletes running fast 1500m : Seb Coe, Cram, Ovett, Asbel Kiprop, Andre Bucher and many others), ENHANCING THEIR LT IS THE FIRST GOAL THEY HAVE TO HAVE.
"
Link:
http://www.letsrun.com/forum/flat_read.php?thread=4460812&page=15#ixzz2eBqutFcR
=> so he advocate that runners should work on their forces
On the contrary, HADD, in the famous and excellent "2 kind of runners" thread with Antonio CABRAL, has written the following :
"
Case 1: [FT runner]
If the points for the 5km are significantly better than for the HM, [...]
This would suggest to me that my long distance endurance is not as highly trained as my 5km performance, so in the weeks leading up to the marathon, I’d be very careful to improve endurance and fat-burning training every week.
[...]
To gain marathon endurance, this (more-FT kind of runner) must expect to lose / give up some speed at 5km. In other words, his 5km performance should worsen as his marathon date approaches. Probably his 10-km will also worsen... What you lose on the swings, you gain on the roundabout.
Case 2: [ST runner]
If the points for the HM are better than for the 5km (and this is possible if you are more-ST – see Cabral & Hadd thread for definition), then I would ensure that I kept up the ability to run a near-PR 5km right up until nigh Marathon day.
Once again, I’d work all the paces from M-12 to M+24, but I would also add in some faster 5k-paced work on a semi-regular basis; you give up that 5km ability at your peril if you are an ST-type of runner.
"
Link:
http://www.letsrun.com/forum/flat_read.php?thread=2375989&page=2#ixzz2eBtcwvG9
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=> He advocates to work our weaknesses
(more speed work for ST runner and maintain our qualities in that domain all year round, more endurance work for FT runner and maintain this quality all year round)
Remark: this philosophy of HADD also applies, according to him, to top level athletes, as in the same post to illustrate he takes LOPEZ vs. MAMEDE and WEBB vs. HALL examples.