This is Jack the Gator.
A. Push your hips as far back as they can go in the chair.
B. Sit close to your keyboard and position it so that it is directly in front of your body
C. Adjust the keyboard height so that your shoulders are relaxed, your elbows are in a slightly open position, and your wrists and hands are straight.
D. Sit at least an arm s length away from the screen and adjust the distance for your vision.
E. All of the above