Oly lifting is different though. They hit 90%+ of their 1RM almost day in and day out and most of the elite oly lifters train 5-6 times a week. Thats more than what most people can handle and to top it off they train multiple times a day as well. Technique technique technique is what it's all about.
Like EM said: the issue boils down to energy. If you can't perform or get in the zone (like EM said), you need to consume a during-workout drink. I find that for me, this is the key element.