A body at rest tends to stay at rest. Just ask T.J. Allen. His research of communications and its relation to collaborating led to the idea of the Allen Curve: the more distance there is between people, the less they will communicate. The effect really kicks in at 50 meters, or 150 feet.
Designing offices to be more compact is one way to counter an aversion to taking a walk at work. This ends up being a win-win for the business: People talk more (coming up with better ideas) and real estate costs go down.
Smaller offices and places for people to gather or bump into one another, as J. Michael Welton writes about in The New York Times, shared offices, compact conference rooms equipped with technology, quiet spots to get away from it all, choices in where to work given the task at hand, all these are elements in creating the right balance. That’s key. Intelligent remixing between individual offices and group and community areas, as opposed to simply shedding real estate, is necessary for enabling one of the organization’s largest resources—its human talent.