BMI is crap. It's like something a 4th grader made up. Height to weight doesn't take into account your bone structure, body fat percentage, level of physical activity. Two people who are both 5'10" and 185 lbs can be vastly different in terms of over-all health. But really the best measurement is a general physical fitness test. How fast can you run a mile, how many pushups can you do, etc. That's something that you can easily test at home and something that it's easy to improve on. Some people with low body fat can be horrifically out of shape.
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