Apparently, according to my sources, this is a real event: The Best Ass in the World Competition. As you can see, both genders compete, no claims of sexism here! That said, Brazil always wins, and all other nation's asses are getting a bit chaffed by this obvious favoritism.
This is real genetic selection in action, of course, and if I can extrapolate, Brazil will utterly dominate the entire world in about 1000 years. Space too, probably, because of their awesome asses. Make a note of it!
And get on the Stairmaster if you want to do something about it. For example:
USA! U!S!A!