I've never enjoyed using indoor trainers, but I recently discovered that my local 24 hour gym has spin bikes and virtual "classes on demand". You select a ride, and the road/ trail appears on a huge screen in front of you while a narrator tells you how hard to set the resistance and how hard to push yourself, depending on the program. There are advanced hill climbs, high performance sessions, moderate sessions, interval rides - you choose what you're up for and away you go. Most rides are in the US but there are a couple in Italy, and quite a few are off road (eg White Rim trail in Utah).