[bryan0]

The Apple watch Workout app has a heart zone view while you're working out, but I don't think it has a workaround summary of how much time you spent in each zone.

[vitaflo]

That gets pushed to the Fitness app on iOS. It breaks down the entire workout.

[ellisv]

But unfortunately Fitness and Health don’t summarize HR zone data across workouts

[tobias5]

The app is not just getting heart rate measurements from workouts but in general. But as mentioned the interesting thing is that it's doing a sum per day, week, month, last 7 days and last 30 days