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Regarding 2. about heart rate zones:
So adding an app or modifying an app with set intervals for different heart rate zones and the app says "take it easy!" or "work harder!" depending on in which zone you are and what zone you should be in? Or a slider showing where on the spectrum you are in that moment?
Have you seen these apps: HeartZone, Workout HRM ?
I'm globally fully supporting all apps that would provide functionnalities present in other sport watches.