She is a successful South Korean rhythmic gymnast.
Rhythmic gymnastics is, as all Olympics enthusiasts are aware, actually incredibly beautiful and impressive.
However, it is perhaps not quite as impressive as what happened with Shin Soo-Ji was asked to throw out the first pitch at a recent Korean Baseball Organization game.
Best. Windup. Ever.
Here it is in action:
Here's the video – keep your eye out for the boys in the dugout reacting: