Fasted Cardio is doing your cardio sesh first thing in the morning. When doing any type of workout, your body will either choose to burn more carbohydrates or fat to give you energy for the workout. Generally, when doing HIIT (High-Intensity Interval Training) the body will burn glycogen (stored carbs) for energy. Doing Low-Intensity Cardio such as power walking the body will burn glycogen first and then switch to fat. Therefore doing a power walk in the morning will work as your body will not have as many carbs stored, therefore you will burn more fat. On the same note, it is not advised that you do a HIIT workout in the morning. The reason has been that you will not have enough energy to do the workout for a good amount of time. Therefore it will not be as effective. That is why I generally prefer to have my power walks in the mornings and a HIIT sesh in the afternoons. Power walking however is not the best to help you lose weight quickly. But it is best to help you burn fat and