Steroids and overly lifting heavy will fuck up your joints and he had none between his vertebrae;look at his posture,shoulders,elbows and his legs,his knees are always bent.
He set out to be great,he did it but at a cost cause he could of lift just not as extreme as he did....he basically showed the bodybuilding world that you could go further and be better cause for a long time they were stuck on Arnold who did great things in those days but that was than.Now their all chasing Ronnie,Dexter,Roelly,Greene...ect where being huge is a must then defined which is the hard part along with balancing roids and the rest of that shit and a lot of them fail.
I also realize that that's the way they were taught to train in the gym cause that's what I remember seeing dudes do is lift heavy til they couldn't lift it but we now know better.