Some of those things are "the posture of the spine, the proper alignment of the hands, the proper alignment of the hands, the elbows and the feet," says Teri, a physical therapist with Alegent Health.

First, you need the right chair. Teri says when your back touches the back of the chair, your feet should touch the ground.

"You also need to have your knees at 90 degrees, your hips at 90 degrees, and you want clearance behind the knees. You don't want the chair to push up against your calves, or up against the back of your knee," says Teri.

You also want to make sure your chair has an extra support for your lower back. If not, you can always add lumbar support.

Once you pick the right chair, you want to make sure your keyboard and monitor are lined up properly.

According to Teri, "your eyes should be looking at the top of the monitor so when you're looking at the monitor, your eyes are looking down just a little."

And you shouldn't have to cock your wrists to reach your keyboard. Teri says your wrists should stay straight and you shouldn't rest them on anything as you type.

It may be hard for your mind to remember to sit like this, but Teri says your body will thank you.

"It should feel very good right away," she says, and she adds that if you're sitting all day, you should be able to prevent injuries and strain by taking a break every half hour.