A treadmill can be so much more than just a cardio machine. This treadmill dumbbell workout is a great way to switch things up to maximize your fat burn for the day. Treadmill workouts can be much more than just a walk. We all know how great the treadmill can be for cardio, but did you know that you can kick it up a notch? You can turn a cardio treadmill workout into an upper body strength workout at the same time. Tap the pin for treadmill workouts for beginners.