Stimulants for fitness.

[cryingfreeman]

Caffeine - at least, concentrated dollops thereof - might dehydrate you which is not what you want at all. I hike as often as I can in the mountains here in NI and what a difference being fully hydrated makes. And by that I mean simply water; no tea, no coffee and none of that isotonic crap in my system! Talk to any hillwalker or mountaineer and they'll say the same: hydrate, hydrate, hydrate!