Mine is pretty simple.

I made my username when I was still in high school, and my main extracurricular activities were singing (choir), dancing (ballet, modern and musical theater) and running (track -- I ran the 100m hurdles and the 400m dash)...I spent so much time doing these activities that they essentially made up my life.

I no longer dance or run (dance at my school is super cliquey and I was part of the group my freshman year but got tired of the drama, and I have a really bad ankle, so I really can't run anymore)...but I kept my username anyway. I do still sing though.