I was just thinking that you CAN look like that and work out...you CAN...but not many people do for very long.  That's because HIIT, even the way she is doing it, will DESTROY your joints if you do it at that weight for very long.  And because you would have to WORK at keeping up your calories if you did really serious exercises and weren't in an enormous surplus to stay the same shape and size.  If you like working out or if you work out a lot, you almost always end up making tiny changes to your lifestyle so that you can work out better.  And you can't work out very well with a body like that.  The way she stomps around awkwardly is proof of how hard it is for her.  People rarely eat themselves into a state where they are fat but really working out.  It's like the "fat jogger" that Runner's magazine had.  You look at her race results, and she basically moved at a brisk walk.  She wasn't really running. There are a very, very few people who have such a serious problem controlling intake that they do faithfully do cardio and are still fat.  But they are such a tiny minority.