People can offer "calorie predictions" but it's really complicated to truly know how many calories you are buring based on:
Target heart rate during the exercise
Your weight
Your effort (and how accustomed you are to the execise since we all get used to the "same old" and don't burn as many calories as we do when it is a new, tough effort).
A scientific way to know is to do exercise/metabolic testing which is offered in many gyms, fitness settings, sport's doctors offices and some pulmonary experts do it too.
I'd tell you that you are probably burning a couple of hundred - maybe 200 to 300.
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