I am about halfway through my run and my heart rate drops really low. I know it's not me because I'm working pretty hard. The section of the run is also quite flat. It has happened twice now in the same place on my normal running track. Yesterday and about 3 runs ago. Any ideas? ciq.forums.garmin.com/.../1433719.jpg
Looks like a standard optical HR graph during an activity. i.e. they don't work consistently for anything other than sitting and walking. I've owned a few different Garmin devices with optical HR and none of them were even remotely accurate when running.
