How I Built This with Guy Raz

Fitbit: James Park

In 2006, James Park had what he describes as a "lightning bolt" moment when he first used a Nintendo Wii. Fascinated by its motion-tracking controller, James wondered if you could take the technology out of the living room and into the streets. Three years later, he and co-founder Eric Friedman launched the Fitbit Tracker, which allowed users to track…