From The Washington Post:
Strolling to the bus stop, fidgeting during a meeting, standing up to stretch, jumping off the couch to change channels, and engaging in other minor physical activities can make the difference between being lean and obese, researchers reported yesterday.
The most detailed study ever conducted of mundane bodily movements found that obese people tend to be much less fidgety than lean people and spend at least two hours more each day just sitting still. The extra motion by lean people is enough to burn about 350 extra calories a day, which could add up to 10 to 30 pounds a year, the researchers found.