Fitbits, Apple Watches and smartphones can actually hurt your workout
Get Fit with Will Smith's Fitbit Premium Program
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Your New Challenge: Exercise For 10 Minutes Every Day - Fitbit Blog
Fitbit - REAL-TIME WORKOUT STATS: See live updates of your heart rate calories burned and Active Zone Minutes while doing any workout in the Fitbit app! Cast your workout to a TV
Celebrity Trainer Harley Pasternak leads a group workout using Fitbit... News Photo - Getty Images