When my fingers hurt after too much time on the keyboard, I...
stop typing??? There's really no reason to be playing this game THAT much... Now if it's for a report or essay, then just take a break. I can't say my hands have ever hurt from typing too much, but that said I'm a computer scientist, not a writer.

What really helped me improve my typing speed is...
Watching my accuracy. The more accurate you are, the faster you are.

My tip to improve your typing speed is to...
keep practicing, but don't forget to switch things up. Don't let the mind get bored.