The thing with BMI is it is a good system for a vast majority of Americans to determine over/under weight.
A very small percentage of Americans have a higher than average BMI due to muscle mass.
Just to put it in to perspective, many fitness sites/mags estimate about 10% of the male population can bench 225, and you get into fractions of a percent that can bench over 300. Those are the people that are overweight from muscle on the BMI scale.
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