Great interview
http://japanrunningnews.blogspot.com/2008/12/samuel-wanjiru-shares-secret-of.html
Here's a snippet bound to start some buzz:
Q: Is that really it? Japanese runners train much more than that. (in response to hearing about his relatively 'light' training)
That's right, they do. They train way too much. For example, if they have a time trial scheduled and it's raining they do it anyway. If I were them I'd take the day off and wait to do the workout on a nice day. Doing it that way you can run a better time and leave with a better feeling about the workout. Japanese people are too serious about everything and don't like change. If training doesn't go 100% according to schedule or they don't run the times they are targeting they get all out of whack. When they go to do altitude training they try to do exactly the same training menu as when they're on low ground, too. It's bad for your health. At altitude you should run with a slower pace or just less. You should also train less in the summer and do it somewhere as cool as possible.