Online fitness advice is notoriously bad. So why is it so popular?

Exercise gurus and fitness influencers are all over social media with supplements and research claims. Broscience is in your feed telling you about fad diets and free weights — but how much is actually supported by science?

Quartz News speaks with scientists, researchers, and fitness experts about the sources and research behind the proliferating stream of advice online. (Along the way, we offer some commentary on the most absurd tips we've come across during our research).
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