>Basically humans are the greatest long distance runners the planet has ever known. While I like your enthusiasm, recall that most species that ever lived are

>Basically humans are the greatest long distance runners the planet has ever known. While I like your enthusiasm, recall that most species that ever lived are now extinct. What makes you so sure that a few hundred million years' worth of evolution never produced a better endurance athlete that had fitness for a time but subsequently died out as Nature moved the goalposts?