slumcat
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I'd say it depends on the person. If it's an actor who is into the fitness lifestyle and would have a strong/big body regardless of the role, then it could be sustained for as many movies as needed. I think Cavill could definitely sustain his great shape for a long time if he stays with it. He seems to enjoy it, which is great. Also, the gains don't just disappear, with each movie his muscle mass and conditioning should be better, unless he completely lets himself go between roles.
I think it might be limiting as an actor honestly. There's two ways it could go.
If Cavill wants to exclusively do action blockbusters, then he can maintain his physique at this size and be good for it. Some actors in this bracket are/were Scott Adkins, Jason Statham, Sylvester Stallone, Jean Claude Van Damn, etc. etc.
If he wants to branch into indie films and stuff he'd have to slim down. Hemsworth does it a lot. He gets big for Thor but then has to slim down or even get emaciated for projects in the middle. It would give more career opportunities but would probably be bad for the body - this constantly swinging from slim to huge to slim and again.
So it depends what kind of career he wants. He had himself said that keeping the Superman body always will prevent him from doing other parts so who knows.

