The amount of energy burnt by a person to do an activity should be different for another person doing the same activity. How does the smart watches and similar devices calculate calories burnt?
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They guess, and most of them are pretty bad, because people like big numbers and therefore like devices that do that. Some devices also measure both basal metabolism – how much you would burn if not exercising – and exercise metabolism.
The only fairly accurate ones are calibrated exercise bikes and bicycles with power meters; those are probably within 10%.
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