Soreness Means You're Getting Jacked
It says nothing about quality, but it does just feel good sometimes and that's ok.
Grapefruit and Pooping Help You Get Strong
If it is something people believe, don't believe it yourself. No proof here, but grapefruit, poop, and squats aren't a regimen your doctor is recommending.
But that's not a thing people believe. Right?
Broadly speaking, if the fitness facts you're being sold sound too good to be true, come in "easy payments," or talk big about toxins without being able to talk science, that advice is worth being skeptical of.