From the article:
On any given day in Denver's City Hall, it's common to see employees racing each other in the stairwell. It's not an emergency drill. Denver mayor John Hickenlooper has established a "no elevator" policy amongst his staff.
"If I catch someone taking the elevator, I glare at them," says Mr. Hickenlooper, who created the unofficial rule in 2003 in an effort to make his staff more health conscious.
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