As Arthur ALWAYS said; "Don't look at what John Walker or Lasse Viren were doing when they were at the top of the game (unless, of course, you're at that level!); but what they were doing 10 years before they reached that level. Don't look at what Kenyan runners are doing today; look at what they were doing 20,000 miles ago." You look at what El G is doing today and say, "Ah, look, in order to excell in today's high level competition, you need to kill yourself doing hard fast intervals!" If you really want to kill yourself, go ahead and do it that way. But if you want to reach his level in 10 years time, check out what he was doing when he was 16 (by the way, what I heard was that he was then a 5000m runner and packing up some mileage).