Is power lifting some kind of trendy excuse or innuendo I'm not familiar with?
Arnold is 6'2" and weighed 235-240 as Mr Universe.
Lollerskates.
The plain and simple truth is this: Having a good BMI rating != (is not equal to) being healthy.
Take a look at some of the best football players out there. Vernon Davis is a perfect example.
6'3" at about 250lbs. According to that chart, he is obese:
That is not to say that the gents talking about body building are this fit, but they are in much better health than the 6'2 180lb kid that drinks Mountain Dew and eats cheeseburgers but keeps his caloric intake at the right level to maintain a proper weight.
That said, I used to do lifting in highschool as part of a football program, and have a bunch of muscle underneath an unhealthy layer of fat. As a result, I weigh a lot more than I look like. Muscle weighs more than fat, that is the underlying problem with a BMI chart. Generally speaking, a BMI chart is accurate for the normal person, but not for those who are muscular.