Its a load of crap
The BMI table is crap. Its based on very old statistics. Anyone who is over 6 ft 2 inches in the old measure will tell you that to fit into the BMI table they are so thin that people start asking if they are ok. I know a guy who is 6 ft 4 inches tall and weighs 117 kg with a rested heart rate of 63 who would blow thw BMI table off the planet. I for one would never have the balls to tell him he is unfit.
Groggy