When I first bought my Garmin fēnix 6, I was really curious if the optical heart rate (OHR) sensor was as good as a strap. So I ran some tests, and it was just OK. The problem I had with it is perfectly summed up in this quote from DCR’s review of the Scosche Rhythm+ 2.0 Heart Rate Sensor: And this is a perfect example of what I typically see for wrist-based…

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