If you mean workouts without tapes, heres an idea. Keep in mind that I tend to make things overly simple, whether that good or not.
First, (after you've decided how long you want to work out) have your bike in a room with a TV, and be sure you have on a program that really interestes you.....you may have to tape something, or get a movie at the video store.
Second: do a 5 minute warm up
Third: go into a steady pace, gradually cranking up your speed and resistance level. Do this for another 5 minutes.
Fourth: Start adding intervals, meaning increase your speed and go all out for about two minutes, then bring it down to your previous steady pace.
Fifth: Alternate this pattern until you've reached your time limit (30, 40, 45 minutes,or whatever)
Sixth: Cool down for another few minutes or so.
That's all folks.