If you are looking to burn fat fast, then the first thing that you must absolutely have is a nutritionally sound diet plan. To put it simply, if you do not have a proper nutritional plan, then you probably won't get the results you want by exercising. By having a good diet plan, exercising is MUCH more effective and results will show faster.
That being said, some exercises burn fat much more effectively than others. These exercises work primarily by increasing your metabolism. That is, when performed correctly, these exercises will boost your metabolism in such a way that you will continue to burn fat throughout the day. These workouts are great because they typically don't last too long yet allow you to burn calories long after the workout is finished. Read our guide to losing weight here.