![]() Clearly something was wrong that night, but what? Answering that question is supposed to be Jawbone's big plan, the thing it says it can do now that you have all these sensors strapped to your wrist. That seemed good! A few nights later, it was 74 bpm. The first night I wore an Up3, my RHR was 55 beats per minute. But for all that tech, the band doesn't care for anything but your resting heart rate, and I don't know why it measures even that. #Jawbone up sleep tracker skinThe inside of the Up3's band has five square metal contacts, which use tiny currents against your skin to get heart-rate readings. Among other things, there's even some evidence that if your resting heart rate suddenly spikes, you're about to get sick. It's a really good indicator of your overall fitness level, particularly as it changes over time. Your resting heart rate is a particularly useful number-it's the point where your heart pumps the least blood, usually right after you wake up. ![]() And it's a new focus for a lot of fitness trackers, from the Fitbit Charge HR to the Microsoft Band to even the Apple Watch. OK, moving on: Let's talk about your heart. Everything else about the Up3 is snake oil. Or buy a Fitbit, or any of a thousand other basic fitness trackers. You should buy the $100 Up2 instead, which tracks your steps and sleep just as well. Even after Jawbone took six extra months to improve and perfect it-thanks to production delays, because waterproofing is hard-it didn't get it right. It's wildly ambitious, and spectacularly flawed. ![]() I'm going to tell a long story in a second, but here's the TL DR version: The $180 Up3, Jawbone's latest wrist-worn fitness tracker, is very few of the things it promises to be. ![]()
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