All of the keys
Push your hips as far back as they can go in the chair.
Sit loose, like you would at the movie theater
Sit as close as you can to the computer, about one inch would be proper
Incorrect fingering position
Correct fingering position
Europen fingering position
Body positioned directly in front of your computer
Feet on the floor
Fingers on Home Row
Quiet Wrists and Elbows
Eyes on Copy/Screen
All of the above
Here's an interesting quiz for you.