Winter is here. I would like to continue my exercise indoors for the season. Does anyone have personal experience with using an adapter for the cruiser bike ? Or in your opinion would it be better to buy a complete recumbent exercise bike. I imagine it would be rough on the knees to get one of those heavy flywheel contraptions rpm up to cruising speed. http://cnj.craigslist.org/bik/5935719928.html