Sit right there!

Long hours at a computer can be a pain — in the shoulders back and wrists.

Health advisors at the Mayo Clinic studied the various ergonomic factors involved in working with a computer.

Chair: It should have adjustable armrests, height, lumbar support and seat depth.

Footrest: If desk or chair adjustments don’t allow for keeping feet flat on the floor, use a footrest. A stack of sturdy books can fill the need.

Monitor: Placed at arm’s length and directly in front of you. If you wear bifocals put the top of the screen slightly below eye level.

Arm and wrist: When typing or using your mouse, keep your wrists straight and upper arms close to your body.

Desk: Should be high enough so knees and thighs have clearance underneath the desk.

Mouse and keyboard: They should be within easy reach, side by side on the same desk surface. Use a standard size keyboard.

If you don’t need the keyboard number pad, select a keyboard without it. The saved desk space allows closer placement of the mouse to the actual keyboard area.

When choosing a mouse, fit it into your hand. Roller ball models may be more comfortable and require only movement of the fingers. An optical mouse requires movement of the entire arm.