NYT confirms that the ‘drug’ we love the most is still the one to love the most. Brewing my first cup of the day right now 
“Caffeine, it turns out, actually works. And it is legal, one of the few performance enhancers that is not banned by the World Anti-Doping Agency.”
“Exercise physiologists have studied caffeine’s effects in nearly every iteration: Does it help sprinters? Marathon runners? Cyclists? Rowers? Swimmers? Athletes whose sports involve stopping and starting like tennis players? The answers are yes and yes and yes and yes.”
http://www.nytimes.com/2009/03/26/health/nutrition/26best.html