Especially when you consider Jackman is fucking 55 years old. In the pic in the left from 20 years ago, he's too old to look like the pic on the right.
I thought that was the joke of the movie. That his abs are fake. Because they looked so super oiled up and fake. I don't even see why not. They can only maintain that kind of physique for a day of shooting or so.
I don't know if it'd be healthier if the guys getting superhero bodies just said it was done to drugs (like Tom Hardy), plus having a personal doctor, trainer and chef - just something that is unattainable for most people and unwise. As I imagine it's a contributor to the problems with men's mental health.
You also have to wonder about the actor's long-term health as things like HGH are really risky and diuretics can really put a strain on your system. If I was in the current generation of superhero actors, I'd be keeping a close eye on the first generation of musclemen, action heroes. It may be, with Hollywood money, you get regular checks to spot problems early and avoid the fate of a lot of the bodybuilders and wrestlers in their generation.