i read that being muscular is usually a blue-collar/poverty signal. real rich people are built like tennis players and triathletes.

It doesn't matter how rich you are, how overpriced your watch and how big your house is.
If you don't have the body/face/hair to back it up, you're coping.

Why should you be concerned about their opinions of you?

imagine giving a fuck about what rich cunts think of you
that's prime retarded bootlicker behaviour.

What? No, the lower class is fat and obese, manual labor doesn't actually make you fit it breaks your body. Gym culture is mostly a middle to upper-middle class thing, and the upper class have shredded physiques due to personal chefs/trainers and lots of free time because of surplus wealth from bullshit jobs.
The billionaires go back to being fat because they're old and so rich they don't need to look good.