Amount of calories burned
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We swam in the pool three times.
twice with a heart rate strap and once without a heart rate strap
All the indicators - pace - time - average heart rate - are very similar in all training sessions.
In training with the strap, about 650 calories were burned and in training without a strap (measurement from the watch) only 250 calories were burned.
What could cause this when all training data is almost 100% identical
thank you
