Epix v2 and newer devices

Enable the HRV recording at Menu > System > Data recording > Log HRV.

Fenix 5, Fenix 6, FR 945 and newer devices

Enable the HRV recording at Settings > Physiological Metrics > Log HRV.

FR 910XT, FR 620

Turn on your device and enter the Menu. Now press UP and DOWN for 10 times. You will enter the so-called diagnostic menu. Select and change HRV to enable HRV data recording.

We assume no responsibility for possible problems! You do this on your own risk. (Anyway, we enabled HRV on our devices as well and did not experience any issues so far.)

FR 920XT, Fenix 3, FR 235 and older devices

Have a look at the5krunner.com. You’ll have to download a *.fit file and save it on your device.