They might tell you, you burnt 2000kcal today or 300kcal during this sport training. But how do they get these numbers?
And afaik studies showed that they are incorrectly measured. How do the experts check that the data is correct? I mean you need the real numbers but for that you used the smart watch (or similar device).
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It’s an algorithm that runs primarily on on body weight, distance travelled, heart rate, and activity input. If I know that someone weights 150 lbs and I can tell by GPS that they travelled 3 miles on a run, I have a good idea of how many calories they burned. Similarly, if that person indicated that they were doing “gym cardio” (e.g. a Zumba class) and their average heart rate for 45 minutes was 142 bpm, I can make an educated guess about what they burned.
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