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To understand why BMI is not a good indicator of your health and fitness, you first need to understand what the BMI is. I pulled out my handy personal trainer textbook, "Physiology of Sport and personal trainer Exercise" By Wilmore and Costill to get the official definition. BMI was described in the glossary follows: "BMI is a measurement of body overweight or obesity determined by dividing weight (in kilograms) by height (in meters) squared." The text went on personal trainer to say that you're considered overweight if you're female and your BMI is 27.3 or greater or if you're male and you're BMI is 27.8 or higher. It also said that BMI correlates highly with body composition and is a better indicator of fitness than your weight alone. If you're sedentary, then I'll buy the part about BMI being better than going just by your body weight alone, but the part about BMI correlating well to body composition is complete hogwash!
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