People who build up a lot of muscle sometimes fall into odd BMI classificiations.<p>e.g. Phil Heath, Mr. Olympia winner of 2015, is 5&#x27;9&quot; and 250 lbs at competition weight, which would classify him as severely obese (BMI 36.9), even though at that weight his body fat is probably close to the minimum a human can tolerate.<p>For most people, there&#x27;s simply no way to build up that amount of muscle without some form of chemical assistance (e.g. steroids).  If your BMI falls into the obese range, it&#x27;s exceedingly unlikely that you&#x27;re just big-boned and muscular.