I wanted to complete the Zwift Haute Route, but also had a 1hr 30min TR ride on Saturday. Had a brain wave which worked absolutely fine and I think I’ll do it again. The Zwift ride was up Alpe du Zwift and the TR plan was 5x10mins sweetspot.
So I sent the TR schedule as an “outside” ride to my Garmin, then fired up Zwift as usual and rode Zwift whilst also doing the TR schedule as planned!
Clearly I had to match the power output to what TR wanted as Zwift was controlling the trainer, but up the Alpe that was fairly easy to do by varying cadence and gears!