A cardio-burn workout doesn't necessarily have to hit insanity levels to work. As a matter of fact one that doesn't and still gets your body moving and your circulation going is ideally suited for doing as often as possible. The Cardio Hop workout is specifically designed in coordination with the NHS (British National Health service) specialists to deliver a workout that can be done any place anywhere to get your heart rate up. All you need is a little space and just a little bit of time and you're good to go.
Extra Credit: 30 seconds rest between sets.