[Controlling elements? Okay, hold on, he'll try to puzzle that out on his own for a minute while he explains Korra a thing.]

The Olympics are an international sports event held back on my Earth. Every four years, participating countries send a huge team in to compete in a whole bunch of different sports: team sports, gymnastics, martial arts, all kinds of different races. The hosting city changes every time and it's a huge deal. People train their whole lives for it.

[He scratches his temple, then laughs and admits:]

Okay, I still don't get exactly what you mean by pro-bending or controlling elements. Something like what Pokémon do?