Workout Builder structured workouts enable you to export your workouts to your training device. The workouts are based on a % of your Threshold Run Pace.
There is no easy way to change this to Heart Rate at the moment, aside from re-creating the structured workout in Training Peaks based on the Description, using heart rate. Hopefully Training Peaks will make this possible soon.
You can still train effectively by using the Workout Description and your training zones based on Threshold Heart Rate or RPE, although you cannot export the workouts to heartrate-only devices.
It is actually very hard to follow structured workouts on your watch based on heart rate alone. This is because the heart can take several minutes to fully reflect how hard you’re running.
For example, on the pace might go from Z1 to Z4 in one second. But your heart rate would not reflect this, unless you sustained Z4 for at least 30 seconds (probably more).
Heart rate monitoring is great for long steady runs. For the shorter interval sessions it is better to go by RPE (or ideally pace) and then use heart rate as a backup measure of intensity.
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