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What are wrestlers? What are they simulating? They're meant to be fighters simulating combat. What do fighters look like? UFC guys, boxers, etc? They're in pretty good shape in various weightclasses and the heavyweights, at the very least, usually have good cardio. Guys like Mark Hunt are the exception and it's fine to have a couple of fat guys, etc, in wrestling.
But generally speaking, most wrestlers should be in shape because their bodies demand it as well as kayfabe demanding it. Kayfabe demands they be fake fighters and look like it and their bodies demand that they be in shape so they can take the shock of all of those bumps and survive the grind on their bodies over the years.
There is literally no excuse to look like Adam Cole as a pro wrestler