Wrist and finger postures (Tip 5)

[pioneer]

Keep your wrists straight while typing and while using a mouse or trackball. Avoid bending your wrists up, down, or to the sides. Use the keyboard legs if they help you maintain a comfortable and straight wrist position. Type with your hands and wrists floating above the keyboard, so that you can use your whole arm to reach for distant keys instead of stretching your fingers.

Make sure you keep your fingers relaxed while typing and using a mouse. Use a soft touch on the keyboard instead of pounding keys with unnecessary force. (ririanproject.com)