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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Fteacher
I have to add that the Garmin watch knows my heart rate zones, because I've set them up. So I suspect it exports some extra bits of sorted out data in its .fit files that then appear in Golden Cheetah. My idea was that it would be great if the .gpx format included this too.
Maybe I'll ask on Golden Cheetah's forum, but I feel like here's the best place to ask and also to report.