G3CWI
Veteran
- Location
- Macclesfield
its not a rough indication imho, its a guess.
There are plenty of papers discussing where and when BMI is a useful indicator. Suggest you have a look at some of them. As you rightly point out, it is not always a useful indicator but for most people it is a useful indicator. That's why doctors and hospitals use it. Mr Wiggins, along with other athletes, is not typical.
PS if you don't like BMI the waist to hip circumference ratio is a better indicator.