I used to spend all my time on the treadmill and elliptical at the gym and it wasn't all it was cracked up to be. I really started to get results when I began doing circuit training in combination with my cardio. This workout is a great way to start getting back into shape, or tone up for the summer. I do this in combination with 30 min. cardio when I can't get into the gym for my usual boot camp class. Do three times a week in combo with a healthy eating plan.