Watch this video to learn how to burn fat doing cardio. A step by step video tutorial that will guide you through some basic instructions to help you burn fat doing high intensity interval training. Yuri Elkaim from MyTreadmillTrainer presents a very informative lesson on how high intensity training burns fat. He explains the difference between high intensity training and long cardio. Long cardio encourages you to take your time and, for example, go on a 1 to 2 hour slow bike ride. High intensity training, on the other hand, is a 10 to 20 minute fast and intense work out that burns fat just as well.