You can get pretty far just attaching your regular bicycle to a "stationary bike stand", which turns it into a stationary bike. Add in Strava and you have the s

You can get pretty far just attaching your regular bicycle to a "stationary bike stand", which turns it into a stationary bike. Add in Strava and you have the social aspect. Strava has a pretty good free tier. If you want classes, etc that is separate. I already get that via Apple Health. If you want real-time competition, you could use Zwift, but then you're increasing the cost (albiet, you are using a best of breed system and composing from parts.)