More leaks, more women who make Hulk Hogan look like Sally Fields while lifting twice their weight. It has to be that. After all, it can t be genetics. Hell, mention 200 meters to most Americans and they ll tell you that s why they prefer the mall they don t have to put money in any of the 200 meters downtown. It also helps that in the U.S. we have a higher incidence of mental illness.
Drugs have a lot to do with it too.
Steroids bulk you up until you re the size of the Incredible Hulk. And the same color too. The difference is at least the Hulk still has testicles. Of course as with any superheroes, good costumes help. But most have other priorities, such as adding nanoseconds to their already ridiculously fast world record.