[Blarg]

I find coffee is okay for a short burst of energy, but bad for long-term endurance and for things requiring really testing yourself at high levels of coordination, especially if you have to do it for long. It's effect on me, anyway, is very much a dumb, brute-force, short-term increase in energy that definitely takes away some fine detail I already have going. If you want to do a half hour of lifting couches, fine, but if you want to run for hours, do complex drills, or do some light sparring against a really slick opponent, you're better off without it.