On 1 Jan I did my first training run on Zwift, thinking it would be quite a social easy ride for NYD, but no, not a bit. There was nothing about ERG in the invite and anyway I have never used it. Whenever I was told to increase power, I did so and it seemed to have no effect - I was reaching cadences of 115, just to keep up, so I thought. Then I got a message to say I could increase my ERG power using the menu bar, so I did that and slowed the cadence a bit. Towards the end the resistance ramped up and it was very tough, but I did my 40 minutes with an average cadence of 95, somehow finished about 150 out of 300 odd and didn't die..
Still puzzled about how it works!