Yeah, BMI isn't a good indicator for everyone. At my most athletic I was 135 pounds, and 5'7". If you saw me at 135 pounds you'd tell me to go eat something fast. At 150 people say I look thin but healthy, and at that weight I am in the normal to upper normal BMI range, funny enough. I carry lots of muscle in my legs and stomach and no matter what it's always going to be there, despite what the scale says. People who are muscular are sometimes led astray by the BMI index.