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I was on trainerroad last winter but since the iOS app for zwift was released I've been using it far more. Chasing someone up a virtual hill makes threshold work far more tolerable, I find. The problem I find with Zwift, however, is that it's too hard not to chase someone's wheel if they pass you on a hill, at which point any suggestion of staying in zone 2/3 for a ride goes out the window.
Have you tried TrainerRoad or Zwift ?
I used to dread indoor trainer work, but now look forward to TrainerRoad sessions. The training plans and workouts make training interesting, and you can watch a film with the TrainerRoad info-strip at the bottom of the screen. Can quite happily do 90min sessions now, would of struggled with motivation to do it previously.
Still would prefer to ride outside of course, but in winter evenings what are you going to do ?