BMI is essentially an average of how much you weigh for you height. It isn't always accurate because there can be a really buff guy (where muscle weighs more than far), however, he is really short. This would mean his BMI would be very high. But even though his BMI is high, his cardiovascular health is probably still top notch. On the other hand, if someone has a high BMI because they just weigh alot and they have an average height (a likewise high BMI), they are probably going to have bad cardiovascular health.
