I have a couple of Spinvervals discs that we've ended up with for free, but they are 2-3 hour endurance workouts. I'm thinking it might be good to have something closer to 45-60 minutes...perhaps more of a spin class format, higher intensity, intervals. Something to do 1-2x/week, as a contrast to 1-2 longer, slower workouts while watching TV or a movie.

Any recommendations? I'm kind of eyeballing either 3.0 Enter the Red Zone or 4.0 Lean and Mean.