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No, fitness trackers do not make you fat and they don't make losing weight harder
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Fitbit Flex review: A most versatile, feature-packed tracker - CNET
Fitbit FB422GLWT-BNDL Luxe Fitness Tracker Bundle with Bonus Small Band - White & Stainless Steel - Walmart.com
Amazon.com: BUMOVE Elastic Armband for Fitbit Versa 2, Versa, Versa SE, Versa Lite Fitness Tracker Watch, Adjustable Sport Workout Women Men Stretchy Upper Arm or Ankle Replacment Band Strap (Black) : Electronics
Best fitness trackers in 2023: Top activity bands from Fitbit, Garmin and more | Tom's Guide
Running - Sports Armband - Quad Lock® USA - Official Store