No no, I know you'd never recommend 5 billion exercises, but that's what I see a lot of beginners doing -- "Oh, today's arms day, so I'm gonna do preachers, and concentration curls, and dumbbell curls, and upside-down-and-sideways cable curls, and..." It's pointless and probably does them more harm than good. I agree that a progression is needed: short full-body workout --> upper/lower split --> more advanced splits. And I'm glad to see somebody else knows about glycogen depletion. So many people do hard cardio before lifting without realizing that they'd be better off the other way around...