[naner]

Somebody would give a shot at explaining why (most) Brazilians were singled-out in this example?

Most people who don't live in a sedentary society probably still have good posture and maintain their natural skeletal alignment. I don't know if this applies to all of Brazil.

[rglullis]

Contrary to the stereotype, Brazil is significantly industrialized. The average Brazilian is as sedentary as the average American/German/Japanese.