Difference in training for Modern vs Classic bodybuilding physique

If you look at the physiques of both classic and modern bodybuilders, you can definitely see a difference. Classic bodybuilders such as Arnold and Flex Wheeler have smaller waists, more streamlined legs and different proportions to modern bodybuilders such as Ronnie Coleman.

But what exactly causes this change? What difference in training and diet, or which change in drugs, is the cause of this very visible difference?

submitted by /u/lockartist
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