As an athlete you are able to set your Heart Rate zone.

To set the HR Zone just go to your My Profile in the menu.

By default the 5 zones are set to:

Zone 1: 50 – 60%
Zone 2: 60 – 70%
Zone 3: 70 – 80%
Zone 4: 80 – 90%
Zone 5: 90 – 100%

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