I haven't seen a BMI scale used since I joined, as you said it is largely irrelevant and some of the fittest people are indeed classed as 'obese'
That's because it's designed for the average person that does the average amount of exercise, not marines or Gym rats... Unfortunately on this forum most people still insist they are in the latter categories even though their idea of exercise is moving their mouse and getting beer from the fridge...
