Sitting and Disability.

For the first time, a study has labeled sedentary activity as a risk factor for disability for people over age 60. Using data on over 2,000 adults over 60 years of age, researchers were shocked to discover that being sedentary is just as large a risk factor for disability as not exercising, and the risk of disability dramatically increases for each additional hour spent sitting at a computer or on the couch watching TV.
Journal of Physical Activity & Health, February 2014