"People who are sedentary have increased inflammation just as a result of sitting," said Dr. Mark Gillanov of the Cleveland Clinic.
Increased inflammation in the body has been linked to heart disease.
A new study found markers for inflammation were twice as high in people who spent more than four hours a day sitting in front of a computer or television.
The solution is exercise.
"Take the stairs instead of the elevator, Dr. Gillanov suggested. "Walk down the hallway to talk to somebody instead of sending an email."