Ahh. Finally Madcow mentioned what I was waiting to see throughout post after post of redundant babble. It depends! That's all that needs to be said. Going back to the original question-why did training style change? If you watch "Pumping Iron", you only see the Big Guys, the Genetic Freaks, the Guys who take.....oh, I think you know what they take! They can work out as much as they god-damn well please, because recover periods sure are a lot faster! But for the general population, it depends on your genetics. Some people can work their balls off in the gym and never worry about overtraining. Other people-yes, it's very much absolutely possible to
overtrain. It's called Exercise Science. Buy a book. It's not b/c they're pussies (very observant

). Everyone is different and everyone has different training capacities. For me, if I do more than 3-4 sets of biceps once a week, I'll be overtraining Bi's. Period. Want to refute that? Here, I'll let you borrow them for a while. The pro's today can lift bodyparts more than once a week (even though most I know admit they don't-probably lying). But for Jonny poo-bear who doesn't juice like it's an oxygen tank, it's definitely POSSIBLE to overtrain. Plus Jonny poo-bear may have job, and can't spend all his waking hours in the gym. Pretty rational scenario I'd say.
Oh, and there was GH back in the day just on a side note. Know that gap in Aronld's teeth? Yeeeahh

(disclaimer: not all people with teeth gaps take GH)
Peace.