What people think Reg Park did and what he did by his own admission are very different things though. He did indeed train full-body, but not at all like the:
All for 5x5...
That some people claim he did... I don't even know where they got that idea.
I've posted this before... But here goes... His actual training approach was beyond ridiculous (same for his diet, really... Pretty much all carbs)... Way more extreme than Arnold's if you think about it, at least Arnold didn't try to do it all each training day.
This was his older routine:
No squats either.
And then later on (up to four days per week now):
Yeah... Not quite what one might expect.
He pretty much did what others might have done on a bodypart split (hell, more pressing and WAY more work sets, though it isn't clear whether he was really doing them all at the same weight... he occasionally mentions stuff like "5x5 working up to x lbs"...)... But condensed to one day.
I found this pretty interesting. Completely different from what some authors have claimed, too... Now we know where Arnold got his crazy volume idea from.
Mind you, I'm just posting that as an interesting bit of trivia... Others didn't go to such lengths.
Anway... Full body or split... Who cares... It's just a classification... Not a factor to base the entire routine around in the first place...