You mean like being socially awkward, or having a knack for something?
I meant that IQ itself is a bunch of nonsense, just like BMI is nonsense.
Well BMI only truly fails if you have those very muscular guys and gals, also I presume there is a certain margin of error.
Better way is to measure your stomach size but just looking down and seeing a fat blob of meat is probably an indicator to start doing something about it.
IQ to my knowledge has a small margin of error as well and definitely through the times they have made the testing way better scrapping culture biased stuff and so forth, it could even be made without having to read anything for people that can't read that's prolly a good thing.
Of course if you feel like horseshizzels you will make your test not as good as if you were in top condition.
Nonetheless fact remains that the majority of cases, people with a high BMI have an unhealthy lifestyle, just because there are some muscular people out there which are nowadays a minority will not change that.
Same with IQ although still young as it is the many studies done to see some patterns in human behavior remains a fact, this does not mean that it's a 100% predictor of course...