I agree with Exercise-lover about liking Low Impact Challenge premix #5, which is the warmup, blast, bonus, and cool down. I did this just the other day, skipping the cool down and adding upper body work from Turbo Barre. The blast and bonus segments are non-dancey routines using the step. There's no complex choreography to learn. Just straightforward athletic moves to get your heart rate up and keep it up. The bonus segment is also on the Cardio Supersets disk in the Low Impact Series. It's a favorite of mine for adding 20 minutes of cardio to other workouts.