The colors for different heart rate zones in the map of a completed exercise, such as walk or bike, are too close to each other to differentiate on the iPhone app. Use different colors that are easy to differentiate, like you used for displaying pace.
Moderator edit: updated subject for clarity
Would make it possible to see time in cardio and peak and correlate that to the exercise at that time, in my case (running) combinations of speed and grade and sometimes altitude
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