Name: Endurance in Zone
Author: Hovland

Allows you to define three power or heart rate zones with a duration each, and helps you keep track of them and fulfilling them during a workout.

Have you ever tried to do a structured endurance workout outdoors? It can be frustrating. You're trying to stick to a target power, but traffic, descents, and challenging road surfaces all do their best to derail your workout.

With Endurance in Zone, you can let your Garmin device keep track of your workout targets.

For instructions, go here:
https://github.com/torhovland/garmin-endurance-in-zone