GPX simulated Route (not Workout)

General Discussion
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You can create a custom workout in Zwift based on a GPX file of a route.

See the monthly Megathread: Zwift Resource Megathread - November 2022 đź—ş

Specifically, this tool: Convert GPX file to Zwift workout | What's on Zwift?

Using a head unit (aka “Bike Computer”) with smart trainer control is another option, as @Steve_Hammatt suggested. “Potato/tomacco”.