My Gut Feeling is that This is About Right

Elite Runners' Gut Microbe Makes Mice More Athletic – Could It Help The Rest Of Us?  at NPR

Not much I can add beyond "read the whole thing, it's short."  You want biological analysis?  You're at the wrong blog, buster.  We talk physics 'round here.

But damn, I could've used another 13% performance in last Sunday's race.