(Mr Swarzenegger had a heart valve operation some years ago, so a body weight of 245 lbs might have been too much for him?)
Mr. Schwarzenegger used anabolic steroids when they were still legal during his body-building days. Also, Schwarzenegger was born with a bicuspid aortic valve, an aortic valve with only two leaflets for which he had surgery in 1997.
The medical establishment has acknowledged major shortcomings of BMI. Because the BMI formula depends only upon weight and height, its assumptions about the distribution between lean mass and adipose tissue are inexact. BMI generally overestimates adiposity on those with more lean body mass (e.g. athletes) and underestimates excess adiposity on those with less lean body mass.