Editorial ReviewsThe name says it all.Introducing Jillians first pure cardio DVD, Killer Cardio. Its comprised of two incredible 25-minute workouts that progress in difficulty to blast calories while building endurance and cardiovascular conditioning.The workouts are formatted to push you through each move for 20 seconds at full force and then take a 10-second recovery break.Level 1 is slightly easier than Level 2, but Jillian provides tips and tricks along the way to modify to make Level 1 ...