I had scraped some statistics from the London 2012 Olympics profile pages for each athlete a while ago and made a blog about it (Olympic Statistics). There haven't been many entries (OK only one), but I made new one using the Olympians body mass index (BMI) statistics. Histograms of all, male and female athletes, minimum and maximum BMIs.
If you're interested, check it out here. I'll try and make some more updates for the 2012 Olympics before the 2014 start in Sochi in February.