Inversion is one of the most powerful models you can ever use. We often think about our life as a series of problems which begin with “what should I do about it?” The idea of inversion is to flip a problem upside down. A common way to do this is to reach the undesirable outcome in thought and knowing what to not do. The idea is to change our starting point in thought. Instead of thinking about what to do to get fitter, try avoiding sugar.