There are a lot of people who don't seem to know much about El Guerrouj on this thread. The phrase 'if he did some long runs' really struck me. He does a lot of high mileage training. Believe me, long runs are not a novelty to the man. How could they be to someone who has beaten Bekele over 5k. As for fast twitch fibres. He has been a world class athlete for so long, that his fast twitch fibres will be largely oxidative, and well able to function in an endurance race.