Fitbit has a smart way of getting everyone to exercise more -- and people love it

"I'm only 2,000 steps behind Julia, I have to keep going so I can beat her before I go to bed," my wife proclaims as she walks back and forth in the long hallway of our first floor apartment in New Jersey. This is typical evening conversation in the Johnston household where Fitbit rules and couch potatoes drool. My wife is part of a group of people at her job who have banded their Fitbit bands together in the virtual world to create some healthy competition. And as a result of that competition,...