It would be great if Fitbit could integrate fully with Training Peaks, so that planned structured workouts would be visible in the app and available on your device.
https://help.trainingpeaks.com/hc/en-us/articles/234441128-TrainingPeaks-API
The device should be able to actively guide you through the workout, eg set pace range and distance.
Moderator Edit: Clarified subject and updated label
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