This was an old Runner's World article that I remember on this topic... Lot of great infographics and speculation: http://rw.runnersworld.com/sub-2/ http://rw.

This was an old Runner's World article that I remember on this topic... Lot of great infographics and speculation: http://rw.runnersworld.com/sub-2/ http://rw.runnersworld.com/sub-2/ As much as it would be nice to see a sub2 done as a team-effort with rabbits, it'll be cool to eventually see the person who has won the genetic-freak lottery (insane Vo2 max, stride rate, efficiency, etc) and dominates the field all on their own... someone who is the distance equivalent of Usain Bolt.