I keep thinking that a point or two underweight is bad... but then I think about all the swole people who are a point or two overweight.  They're certainly not unhealthy.  I have no problem mirin' someone who's, say, 5'10"/180 with a bmi close to 26, but a bf% well under 10. I still can't get out of the mindset that a bmi under 18.5 is unhealthy, though.  Help me out?