Doc has the technique.
Isn't there(for the people with lots of coin) a treadmill made for you to ride a bike on? I thought I saw something on professional riders using one. Suddenly, this image popped into mind my of a set of rollers/trainer shaped like a hamster/pet wheel. It would take up too much space. I still like the idea I posted in your Indoor thread about the fake setup I was going to make with commercial rollers. That would be a really cool setup for the day I was going to film the video/pics to troll with.
I just thought of another stocking stuffer. It's pricey, but will fit into the stocking. Your pic made me think of it. Better go post it.
Notice I didn't mention it. I have to build up the suspense and drive people to your other thread.