Interval Training on Treadmill - The Best Cardio Workout?

In today's fitness world a lot of the so called experts have figured out ways to make cardio fun, unique, and exciting. They do things like body-weight circuits, kettle-bell circuits, weight lifting circuits, etc, where you move from one exercise to the next with little to no rest. I have to admit, I love doing these types of circuits - they really burn fat and get the metabolism going. In my experience however, you never really get the muscle hard enough (toned) and/or dense enough if you

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