The level of exercise is an important factor in one’s ability to burn fat. For instance, during high intensity exercises such as high intensity interval training (HIIT), more energy can be expended per unit time than moderate intensity as the exercise also utilizes glycogen stores. HIIT also leads to an increase in post-exercise oxygen consumption that lasts sometimes up to 24 hours which encourages fat oxidation. However, low to moderate intensity exercises allow body fat to be used as a source of energy more so than high intensity and after the activity, glycogen tends to be burned more. Thus, it is reasonable to suggest that combining high intensity exercise followed by moderate intensity may be the most effective strategy in burning fats in the body because the rate of basal metabolic activity increases.