Name: Heart Rate Zone Interval
Rating: 4.6 (7 reviews)
Author: torsteinvh

*** Any questions, problems and suggestions, please use the support thread ***
https://forums.garmin.com/showthread.php?334002-Datafields-Heart-Rate-Zone-graphs
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This data field shows the heart rate zone in a moving bar graph. The bar colors change dynamically during the activity depending on heart rate zone. The field is meant to visualize the heart rate during intervals, too make it easier see if the effort is appropriate.
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The data field change appearance depending on the chosen layout.
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This version supports user configurable heart rate zones on watches supporting Connect IQ 1.2.1. 
How to change settings: https://apps.garmin.com/settingsHelp
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The following settings are available (Defaults are provided for watches not supporting user settings):
- Display HR as % of max HR (Default: On)
- Background color of label shows current zone (Default: On)
- Duration of graph in minutes (Default: 15 min)
- HR Zone 1 (Default: 120 BPM)
- HR Zone 2 (Default: 132 BPM)
- HR Zone 3 (Default: 146 BPM)
- HR Zone 4 (Default: 153 BPM)
- HR Zone 5 (Default: 163 BPM)
- HR Max (Default: 194 BPM)
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Development history:
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Development history:
Version 1.0 - December 1, 2015:
- Completely redesigned single field layout
- Memory and performance optimizations
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Version 0.8 - November 18, 2015:
- Reduced memory footprint
- Removed option to set custom label
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Version 0.6 - November 15, 2015:
- Adjustments to datafield displays
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Version 0.5 - November 13, 2015:
- Initial version.