It is not willpower rather a simple decision, to not overeat for several weeks, in order to achieve a fat loss goal. It is not willpower rather a simple decision, to engage in progressive resistance training, in order to contribute to a fat loss goal. (Or any goal for that matter). Ask yourself, what is more important? A long term result or temporary indulgence? If it is the result, then you just made an easy decision and so called willpower was not involved. Don’t burden yourself unnecessarily with the concept of “willpower.” Rather make small decisions each day so, that they become an easy habit.