Losing weight is all about balancing the amount of energy we put into our bodies versus how much we use up through normal bodily functions and physical activity. When we talk about 'burning fat', we are referring to the process of using the energy stored in our fat cells to fuel our activity.
This is a companion discussion topic for the original article at https://patient.info/news-and-features/hiit-or-weights-which-is-best-for-weight-loss