How? You’re a machine! 90 min has me going cross-eyed.
Painfully. A couple weeks ago I did 2 hours at the gym, my post-ride notes:
115 degrees out, headed to the gym for another round with Stages SC3 bike #26 right next to the awesome fan.
55 minutes solo and then spin class started. Did my own thing while the instructor did her motivational speaking. It worked and I pushed thru the mental and butt barriers for 2 focused hours of work.
The people watching is priceless.
Try living in LA. 
There are some real indoor machines, I’m not one of them. The struggle is real.
Has anyone put a Kickr Bike on a rocker plate?
And I just googled it and saw the OmniRocker
I have a homemade rocker plate that was used for a Kickr trainer that I’ll be putting my Kickr bike (that is getting delivered today - woohoo!) on. The dimensions work so fingers crossed it’s successful. My homemade plate is similar to the Omnirocker but without the forward to back motion.
Yup, we have seen all of the smart bikes used on rockers. Examples and brand mix varies, but they are out there.