Hello
I selected a field HR %Max...
Having an HR max of 180 how can it display 21% when my HR is 52 ?
Seems weird ?
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And you are sure that the device has your HR Max set as 180?
Adding to the previous post, you may want to check also sport specific zones, which zone method you are using, and also whether the watch has picked up a different MHR through autodetect.