I have both mag and fluid trainers that I use when I absolutely can't get outside to ride. They (kind of) do the job of keeping me from losing my chops, but it really is terribly boring spinning in one place so I do try to get out and actually ride point-to-point as much as possible, even if that means I still need to go indoors and spin in place a little while to put in an adequate amount of spin time for the day. I've built up my Centurion Super LeMans with fenders and lighting to use as my winter ride. And I hope C&V'ers will appreciate this: I keep my more contemporary Synapse mounted to one of the trainers. Frankly, I ride my vintage bikes on the road a whole lot more than I do the modern ride, so this is probably an appropriate storage solution!