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<p>BMI is just a formula based on height and weight. Or do you mean BF% (body fat percentage) which may indicate “normal weight obesity” for some, but also indicate that muscular athletes who are “obese” by BMI or weight standards are really not obese?</p>
<p>BF% is a better individual assessment, but is more difficult to measure consistently or accurately. BMI is useful in population studies where the small number of “normal weight obese” people and heavy muscular athletes do not have much effect on a large population sample.</p>