I (more than) once wrote 50,000 words in one week. I ate a three pound bag of m&ms to keep the words coming that quickly.
I once wrote a character who was lame. I spent (I think two) days wearing a long strip of fabric tightly wrapped around my left knee to see what it would be like to be lame.
Now I have a character who can write with both hands. So I'm practicing writing backwards with my left hand. Backwards as in hold it up to the mirror and you can read it. With my left hand. I am not left handed. To say my handwriting is juvenile insults juveniles everywhere.
This character is also a mathematical genius, but you notice I'm not hitting the math books. Devotion to art has its limits.