Ok, maybe not strictly a standard or "athletic BMI" but any of the health equations in this link will do. As you can see the waist-to-height ratio is specifically cited as use for serious athletes and body builders.
http://home.fuse.net/clymer/bmi/
This was more of the reasoning behind my "fat" tax. Not necessarily to control people's lives but at least motivate them to be healthy or punish them for not being healthy. As you can see in this article (I know it's a little old) Japan implemented this for people over the age of 40.
http://www.nytimes.com/2008/06/13/wo...495&ei=5087%0A