The Mayo Clinic is pushing for computer mounted treadmills in the workplace. They would like people to walk at 1 mph and burn an extra 100 calories an hour.
The group is called NEAT (Non-Exercise Activity Themogenesis )and measures things like fidgeting and standing. In addition to the tread-desk they also created a perimeter track with whiteboards so they can stand up while developing ideas.
For those interested they say that the cost of 10 workstations is about half that of regular cubicles and costs @$5.50 per square