Exercise

You decide to train your body due to the fact using your quirk in larger or more refined ways requires large amounts of stamina, which you obviously don't have being just 4 years old. By the time ten years has passed you have an incredibly fit body for someone who isn't even 15 years old yet. However due to this your grades have started to lack, because of around 3 years ago you started to train your quirk alongside training your body. The teachers aren't happy with the fact that despite your intellect your grades are lacking. You honestly don't care given the fact that most schools and teachers in the world don't know how to properly teach most adults much less children, though you would never say that out loud or in public. Regardless by the time you are 14 years and 9 nine months old your body is very well developed and your quirk control is quite impressive as well.(high body, high quirk control, medium intelligence, low favor with teachers, medium charm)