Jacob, I'm sorry for not clarifying exactly what I meant. I'm sixteen, so still in mid-teens, and have had piano training. My teacher says that I have a very flexible bowing motion, but what I want to know is, how can a measure if I'm really advancing at a normal rate. It seems as though I'm not getting any better! I can tell the difference between when I first started a year ago and now, but for quite awhile now I seem "stuck." Is that normal?