Arnold had many training partners, namely Platz, Zane, Franco and Waller..... Many of these fellas have talked about their training experiences with Arnie.
Mostly he trained with moderate weight and moderately high reps......he was a powerlifter in Austria and Germany, but in the USA, he was taught by Vince Gironda to focus on feeling the muscle work and concentrate on conditioning.
He did train calves rather heavy, but other exercises were performed with moderate poundage. Squats with 315-405.....bench 275-315 and flat flyes with 60 pound dumbbells.
Ric Drasin, who created the Gold's Gym logo, trained with Arnold and said he was a feel type trainer, Ric went on to say he never saw Arnold go heavier than 55lbs on db curls.......BUT......HOW MANY GUYS TRAINED WITH HEAVIER DBS AND HAD NOWHERE NEAR THE ARM DEVELOPMENT OF Arnie.
Zane said that he and Arnie had great workouts, very focused but rarely went to failure......Platz said Arnie would crack jokes and have fun during rest periods, but when he commenced a set, he was focused.