However Fitbit also uses the heart rate monitor to improve statistics in other areas, such as calorie burn calculations, and it's good at logging your resting heart rate through the day. But because this isn't meant for more serious workouts, you won't be able to see much data on the screen beyond heart rate and distance while you're in workout mode, nor will you have as much data to interrogate afterwards – it's certainly not designed for the marathon runners. It's definitely capable of detecting a run, and at the end of it we found you'll have a reasonably decent read-out of your HR. Read next: Fitbit Alta HR: Ultimate tips and tricks It does have SmartTrack though, which automatically detects what kind of activity you're doing. It's a tracker to keep on day and night, but if you're looking for more serious fitness capabilities, you won't find them here. Instead, it's better for light workouts and keeping track of your resting heart rate, which is really what the Alta HR is about. Now, while Fitbit has packed in a heart rate sensor, it's not exactly the best for intense workouts. The Alta HR impressively packs a sensor into a body no bigger than the original, and keeps track of your heart rate in five-second intervals throughout the day. The major feature difference between the Alta HR and Alta is right there in the name: a heart rate sensor. That said, straps are interchangeable between both devices, so if you just want to put a more secure clasp on your Alta, you can. Other than that, the two look very alike, but the Alta HR wins by having the better band. This keeps the outside of the device as close to possible as the original while fitting more into the guts. Internally, Fitbit has shrunk down the chip to make room for the new sensor and a larger battery. It's the same for sleep tracking – it needs to be as secure as possible while also being comfortable. It's built to be more snug on your arm so the Alta HR's heart rate sensor can work at its most accurate. The strap now has a buckle at the end, rather than a simple button, meaning it fastens to the wrist more securely, like the Fitbit Charge 2. Firstly, and most noticeably, the Alta HR has a new band.
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