![]() (Admittedly, on any fitness tracker, sleep tracking feels like sketchy science.) Fitbit logs the hours I slept well, but doesn't seem as aware of sleep interruptions. Sleep tracking works, but the actual data of light vs. The five-day battery life is OK, but other fitness bands and watches outdo five days regularly. The Charge 2 has some shortfalls, certainly. Sarah Tew/CNET What the Charge 2 still lacks (hint: don't get it wet) The clip-on charger's also a little weird. (And by tap, I mean a hard tap the display isn't touch-enabled, but responds to hard taps via the accelerometer.) If it's showing on the main screen, all it takes is a tap to see the reading. ![]() The biggest advantage of Fitbit's heart rate is it's always on, and really quick to check. ![]() (Fitbit acknowledges this as a bug that it's aiming to address in a future firmware update.)īut the important thing is that the averages worked out fine.and I generally got readings that were enough to keep monitoring how I was doing in a way that matched what I got on your average grab-the-rails-for-heart-rate gym machine. Sometimes readings were high, sometimes low, and sometimes it didn't sense my wrist and I would get a zeroed-out non-reading. It was fine when resting or walking, but when running or exercising it fluctuated. Most wrist-based heart rate trackers aren't, but at least some also let you pair more accurate chest straps, too - you can't do that with the Charge 2. Fitbit's cardio score concept helps, to a tiny degree, but it could use some tweaks.ĭon't take this all as medical advice: the Fitbit Charge 2 isn't accurate enough to provide on-the-spot heart rate you can completely rely on. I love the idea of gamified heart health and fitness, but it's hard to figure out what to do with heart rate when exercising. And to add a little extra kick, it showed me US marathon record holder Ryan Hall's Cardio Fitness score, which is 81. I tapped the chart and was told I could do better with exercise - it showed me where I could be if I lose the weight I promised I would in the app's goal settings. My number was 40, which is "good for men your age," according to Fitbit. My estimated cardio fitness score, before jogging. If you run for a while tracking GPS via your phone (I jog-walked for 2 miles, but you could run for less), it pinpoints a more specific number based on a simulation of VO2 Max, a cardiovascular test for heart health. Here's how it works: It does a basic reading of resting heart rate versus your BMI (body mass index, calculated via whatever you entered, or your weight from a synced smart scale), and charts that against a statistical age and gender range. Instead of the daily heart rate charts and an evening measurement of resting heart rate (which is considered a good baseline measure, but doesn't tend to change much for me), Cardio Fitness is supposed to present a number you can aim to improve. That score is meant to more accurately represent where you're at in terms of overall heart health. Tap on the Heart Rate part of the app, and you can swipe to see a new Cardio Fitness score. There's a sorta-secret feature in Fitbit's app regarding heart rate. Unlike many other bands, Fitbit makes you walk 250 steps to "earn the hour." It made me want to walk more, instead of just standing. I also like Fitbit's tweaks to its other measurements, especially its reminders to move.
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