I have been trying to save some time by riding indoors and wasn't sure if I wanted a DVD or audio for my iPod. I found this website http://www.highintervalworkouts.com/ They have 4 different types of spinning workouts each 60 min long. I have downloaded their ultimate package which included all four workouts, speed, power, endurance, and recovery to my iPod. I love them all. I can do the workouts at the gym or home. It complements my training for the Wildflower triathlon upcoming in a few months.