BMI was never designed to be used as a metric for individuals, and is pretty well known for failing at being a metric for individuals. It's purpose is for looking at a vast swath of population, where the outliers will average each other out. BMI is notorious for classifying people as overweight when they are not. Most college athletes are classified as overweight according to the BMI. For instance BMI considers 132-167 lbs a "normal" weight for 5'10". 174 is overweight. 174 lbs! Over 90% of the collegiate wrestling team I work with would be considered overweight according to BMI.