The Fitbit Flex has officially gone on sale for $100 online and in U.S. retail stores. We saw the “OG fitness-tracking dongle” at CES earlier this year, where it was clear that Fitbit was trying to ...

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Remember Jawbone? One of my first wearables was the UP2, a fashionable bangle-like fitness tracker that provided basic sleep tracking. I fell in love with its slim, unassuming form factor. A ...