Fitness trackers are popular for good reason: They give you an around-the-clock look at your health, from how much you're exercising to how well you're .
Features like a fancy screen, GPS and heart rate monitoring will suck the life out of trackers rapidly, so if the convenience of not having to charge your device .
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The heart rate monitor in your fitness tracker may not be giving you accurate. . The Samsung Gear S3 Frontier smartwatch was the best performing with an .