For PC/Mac

Zwift workout files are saved under Documents/Zwift/Workouts as “.zwo” files.

If you have downloaded a new workout file and want to use it in Zwift, simply save it to Documents/Zwift/Workouts, then start up Zwift. Your workout will appear under the “Custom Workouts” category in the workouts list.

To further organize your custom workouts you can create directories under Documents/Zwift/Workouts and save your workouts to specific directories.

For iOS

See How to copy workout files to Zwift for iOS.