I have a Kickr Core connected to Zwift, which is nicer than just spinning endlessly since it’ll adjust the resistance (unless in ERG mode). But it still gets boring and it’s not like riding on the road. My ass still takes a hit. Standing once in a while helps, but I think the idea another poster had of just taking occasional breaks is best.

I’d like to get a rocker plate, but even there I suspect for longer rides breaks will be needed since you just don’t get the same movement as out on the road.

With my brother I’ve started asking “are you looking for advice or do you just want someone to vent to?”. I think most people can do better playing both roles.