It is something used for travel! It has two wheels. You sit on a small seat between them and have to push little.... [He's not sure what to call them-] Little platforms on the bottom. It causes the wheels to spin. The harder and quicker you push those, the faster you go. It requires balance and coordination, otherwise it would tip over while you ride it.
[At least that's the impression that he's gotten.]
I would like to race you with it Jae-Ha.
[Determined to pedal faster than Jae-ha can jump...!]