When my kid was about 3 he had a nanny who was a circus performer and dedicated unicyclist. So my 3 yo could unicycle (with a cute tiny unicycle) before he could bike.

The nanny said he was a “mountain unicycler”. I thought it was an absurd exaggeration until he showed us a video that had been made of him and a friend doing stunts on a cliff face. We began to worry about his sanity...Luckily my wife considered that a positive thing.

This is not him but some of the kinds of stuff I am talking about: https://www.youtube.com/watch?v=RkppaV-gQXU