One of the problems with office work is that many of us are using chairs that don’t fit our bodies very well or give adequate support to the back, said Jack Dennerlein, a professor at Northeastern’s Bouvé College of Health Sciences in Boston who specializes in ergonomics and safety. If you are experiencing back pain, you may be able to adjust your chair to increase its lumbar support. A good office chair will have an adjustable seat pan that you can slide back and forth as well as adjustable back and height features. First, sit in the chair so the lumbar region of your back, your lower back, is resting on the back support. At the same time, your feet should be resting comfortably on the ground and the back of your knees should be about three-finger widths from the edge of the chair, said Dr. Dennerlein.