There are too many variables to accurately track how many calories are burned during a work out session, so it just gives a rough estimate… very rough. A system would have to know your starting weight, body fat percentage, the amount of sweat and CO2 produced from the workout… etc. Even if you precisely tracked your calorie intake for a month, along with weight, and your exact cycling routine. You could get a more accurate estimate, but as you lost weight and built muscle even that would start to vary.
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