Workout Builder structured workouts enable you to export your workouts to your training devices.
Bike workouts are structured using a % of your Functional Threshold Power.
There is no easy way to change this to Heart Rate at the moment.
You would need to recreate the structured workout in Training Peaks based on the Description, using heart rate and the relevant heart rate %'s.
You can still train effectively by using the Workout Description and your training zones based on 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 riding.
For example, your power output might go from 200 to 400 watts in one second. But your heart rate would not reflect this doubling unless you sustained that 400 watts for at least 30 seconds (probably more).
Heart rate monitoring is great for steady-state rides. For the shorter interval sessions, it is better to go by RPE (or ideally power) and then use heart rate as a backup measure of intensity.
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