Many of the power based training plans generally prescribed based on percentage of threshold \ Critical power. I have used both power based training plans on Final surge and Stryd and both prescribe based on % of threshold power. Ideally it would be great if the app have the functionality to import the structure workouts directly from final surge but for now having to create it manually in WOD using % of threshold power would make it a little similar than inputing the low and high range for each interval steps.
This was a reply to your previous answer Ian.
This was a reply to your previous answer Ian.