Quote:
Originally Posted by
sonick 
Please do, I have a friend who is adamant that having a cup of coffee before any physical activity will suck you dry.
Here's some food for thought, since you asked:
Paluska, S., et al. (2003). Caffeine and Exercise
and
Millard-Stafford, M. L., Cureton, K. J., Wingo, J. E., Trilk, J., Warren, G. L., & Buyckx, M. (2007). Hydration During Exercise in Warm, Humid Conditions: Effect of a Caffeinated Sports Drink. International Journal of Sport Nutrition & Exercise Metabolism, 17(2), 163-177
I apologize for not having edited the first to the standard APA citation form. I don't want to be the dude throwing around pubmed citations (especially since my field of study is econ) - but my point was that consuming caffeinated beverages won't magically dehydrate you.