Being in great shape is the ultimate meatspace proof of work: - Requires a great amount of energy to get to that point - Cheap/easy to verify in that looking at their muscular build is sufficient proof that they exercise (i.e. put in the work to get the output) *tweets at gym*
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or willingness to do steroids

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lol, but if you think about it steroids have harsh side effects, thus making it "expensive" to cheat. also steroids don't just make you magically grow muscles, you still need to work out!
End of conversation
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