I know that heart rate has something to do with it, but if my heart rate is 120 from nervously speaking publicly while sitting still, I’m surely not burning the same calories as I would while swimming or walking up stairs, am I?
A lot of things with calorie readouts are just an estimation. The gps unit I use to track my bike rides knows how much I weigh. It can then estimate how much energy i need to burn to move the bike at a given speed.
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