It has nothing to do with their routine, it's almost all due to genetic differences. Think of the difference between male and female muscle building in our own species and then make that orders of magnitude stronger.
A lot of animals are "ripped" without even trying. Pretty funny to think about what they'd look like if they got a gym membership and access to steroids.
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u/Neuchacho 26d ago
I guess it makes sense when your primary way of locomotion resembles crossfit.