I wonder if the core strength workouts on the Cyclo Core downloads are comparable to the Curves workout? I see a lot of women at Curves who aren't using the machines to their full advantage, but it is a really good workout if you do. It's not Pilates or Yoga, but it seems effective to me.
We don't have huge hills where I live. We have to take the bikes away from here to get significant hills. So, other than going on vacations with bikes, I don't know that it would be useful to work on training for hills.