Oh, yeah! The profuse perspiration of extended stenuous exercise causes loss of electolytes like potassium and sodium. Beer is an excellent source of fluid and electrolytes. At least that is what I used to tell my wife when I ran a lot. That's still my story, and I'm sticking to it. Don't bother to refute it with trivialities like chemical analysis.
MichaelW, here in south Louisiana, home of boiled crawfish and Mardi Gras, I could probably make money importing those bikes that carry a bottle of beer. Man, that's just a Cajun bottle cage.
Rainman