Is your fitness tracker lying to you?

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NEW YORK, NY - JUNE 12: Atmosphere at the Launch Of Fitbit Local Free Community Workout on June 12, 2016 in New York City. (Photo by Dave Kotinsky/Getty Images for Fitbit)

Roe Conn and Anna Davlantes lead a conversation with Judy Pielach, Violeta Podrumedic, and Kevin Powell about a Stanford University Medical Center study showing how well fitness trackers work. While devices tracked heart rate accurately, their tracking of calories was significantly off compared to standard medical measurements.

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