Wednesday | July 14, 2010 | 3:42 PM
Photo Science Work
Sitting is Unhealthy

Ms. Betty Brinkman, at her desk at 356 W. 34th St., New York, circa 1939-1940.

Regular exercise doesn’t appear to fully undo the effects of prolonged sitting in cars, at desks and on the couch.

Your muscles, unused for hours at a time, change in subtle fashion, and as a result, your risk for heart disease, diabetes and other diseases can rise.

(photo via the NYPL Digital Gallery)