I watched the first episode of Netflix Full Swing last night. Pretty good, focused on Spieth and Justin T. It showed them doing weight training, after a practice session at the range, after a competitive 18! That's an example the Woods effect. The whole pro golf world had to raise their game to try to compete with the standards he set.
I might be wrong, but I doubt Arnie and Jack N ever did weight training, at least in their prime? I think Gary Player was known for a lot of calisthenics and emphasizing fitness, he was a bit ahead of his time in that regard.