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Amazon Halo View review: This $79 fitness tracker excels at the basics | CNN Underscored
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GRV Fitness Tracker Band Replacement Strap S1 No Bluetooth Fitness Tracker (Black) : Sports & Outdoors - Amazon.com
Amazon.com: POLAR Unite Waterproof Fitness Watch (Includes Wrist-Based Heart Rate and Sleep Tracking) : Electronics
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Polar A360 Fitness Tracker with Wrist Heart Rate Monitor - Medium, Black | eBay
Amazon.com : Polar M400 GPS Smart Sports Watch and Fitness Tracker (Black) : Sports & Outdoors
