[mirekrusin]

That’s because muscles are heavier than fat, right?

[treis]

BMI assumes you have an average amount of muscle. Any weight above that is assumed to be fat. So for someone like the Rock it treats a lot of muscle as though it were fat.

[rhino369]

It also doesn't a good job of modeling ideal weight for short or tall people. BMI models a human in only two dimensions.

[pmalynin]

They are more dense, yes.