I am not a very fast typist. However, to my children (ages 10 and 8) I am a superstar typist.
When my children walk into the room and I am working on my computer they usually comment on how fast my fingers are moving on the keyboard. They are amazed at the clicking sound my nails make when I type quickly and they often try to replicate it when they play on the computer. Clearly, my fingers are important for typing but my brain, my eyes, and my internal organs are all functioning to help me.