I mainly use this app while cycling, so my review is based around that. I enjoy hearing the zone sounds while I’m working out, since I’ve had issues with recording workouts with my watch in the past. Recently, I was 55 min deep into my ride, only to notice that even though the HR zones were still sounding, the ride had paused at 4 min. Joy. Next day, it happened again, but a bit further into the ride. Turns out that if you take a screen shot (of a song that’s playing and you want to remember it, easy enough to do without looking at watch) or tell your Apple Watch to remind you to do something later (best thinking comes while I’m on the bike), it pauses the workout, and you have no real way of knowing unless you are able to really look at your watch while moving (hard to do on moving bike and watch is worn on forearm). The app pauses when you are stopped, which I like, but since I would have to stop to see if the app was recording… You might be thinking “why don’t you hit resume or continue or whatever?” Because there is NO WAY to unpause the workout! So, Zones team, please fix the issue of pausing the app when things like a screen shot are taken or Siri is activated, or at least throw in a “resume” workout option.