Smart Phone HR Zone App for Apple Watch-
Matt Fitzgerald’s book says there is a smart phone app to help calculate HR zones, however, Matt does not qualify this with any additional information. The link to the website points to a smartphone app specifically for Garmin running smartwatch devices. The app seems to ONLY work with Garmin devices, and as far as I can tell, there is not a compatible version of the app that works with any other devices, such as the Apple Watch device that I have and use. Neither the book, which I have and read, nor the website, mention this important detail about the app. Very unclear.
The HR zones are a bit confusing and I would like very much to have a version of this app that works with my Apple Watch that can help calculate my HR zones for me.