Arguably, body building by definition isn’t vegan.
If we accept that crop death is inevitable, body builders are unnecessarily killing more animals purely for aesthetic reason.
I wouldn’t ever say that to a non-vegan as it’s just too in the weeds, but still interesting.
Athletes and body builders are different things, though a more extreme case of the argument still applies. But then, it also applies to riding your bike to see a movie, because refraining from seeing the movie is practical and practicable, and those extra calories you expended mean extra crop deaths. I’m not yet convinced this qualifies as exploitation or cruelty to animals.
Yeah it’s certainly more philosophical than practical. Here’s another odd quandary: we as vegans agree that in certain situations, it’s okay to kill an animal (our favourite “stuck on an island with a cow” scenario). If people in remote artic areas HAVE to kill and eat animals to live, are they technically vegan? They’re avoiding the use of animals as much as is practical?