I like having a variety of premix lengths from 30 minutes (anything less than that could probably be created by us using the warm-up, one workout segment, and the cooldown, so could be easily done using the chapter menu--in fact, if certain workouts could be used in that way, but don't contain a shorter premix, it might be nice for SNM to include a small crib sheet with each DVD that would list not only chapters, but give suggestions on mixes we could easily make on our own, which would add to the variety of ways we could use each DVD) to 70 or 90 minutes.