More to the story wrote:
I think that some of this has to be taken with a grain of salt.
Firstly, you're talking about a mega-talent that has already run in three Olympics and races a distance that lasts less then 4 minutes. He would be the first to tell you that it takes different areas of emphasis to train for different events. Obviously his training would not work for the 10k, etc.
Secondly, he's been at a long time, he's 30 years old. He has a huge bank built-up of training. You're talking about a guy who can run 4:00 miles in his sleep. He has literally come off of injuries and been under 4:00 in 2-3 weeks time.
Lastly, you have to look at how the thinking applies to what you do. Everyone has different needs. There is no magic formula. And truthfully you don't need a gym to do core work or many resistance-type strengthening exercises. Heck you don't even need a track (go visit Kenya) to do speed work.
Again, I think a lot of this has to be taken with a grain of salt. Willis could work 1/2 as hard as 95% of the college runners out there and still be beating them. His genetics are off the charts, you don't run 3:30 for 1500m unless you were born with the tools to do so. His brother was also a sub 4:00 miler as well.
This is pretty much what I was going to say. Great post. A lot less work is necessary to maintain fitness after years of training than is necessary to build that fitness in the first place. I think any seasoned runner has realized this at some point when they find they can run a 17:00 5k off of virtually nothing while your average Joe Public struggles to hit 20:00 even after months of 35mpw. Having several years of serious training under your belt (or 10+ years in Willis' case) brings your baseline fitness to a level FAR beyond what most people will ever experience.