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The slogan should probably be "Learn about your body." Also, there may be some truth to the second part which resonates with what Arnold says: "Shock your body!"

I never interpreted "listen to your body" as "give in to all your body's whims", it's more like: if in your experience you feel better after doing X, then X is probably good for you.

Yes, precisely, if your body tells you to eat cake all day and there are no other consequences then why not?! However if you get fat and unhealthy then guess what - your body tells you to stop eating cake like a maniac. So my argument still stands - listen to your body.