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Football players/wrestlers/gymnasts aren't taking health advice from strangers on the internet.

Football players, sure, and a bunch of other kinds of athletes ... But aren't gymnasts typically relatively light?

Yes, gymnasts are typically very lean. Source: I used to be one, though I'm not particularly lean anymore sadly.

What are the odds that someone posting on this site falls into those categories?

More common than you might expect!

You do not need to be a professional sports person - keen hobbyists exist and there is definitely a group here that are into power lifting.

I am an avid powerlifter and used to compete in submission grappling. Now I write TypeScript code.