Yep, it's pretty easy with Best Bike Split and TrainerRoad. You just drop your GPX file into BBS and hit the "Export for TrainerRoad" button. Then you drop that file into the TR workout creator and you now have a simulated course ready to go. Here's some more info on the workout creator: Creating a Custom Workout

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Professional Mountain Biker and Community Manager at TrainerRoad - Cycling's Most Effective Training Tool