One of my roommates has been working out for several months. She was tired of this feeling at first, but she got used to it over time. Because you should not only practice, but also pay attention to eating. Some foods are taboo at ordinary times, so the process of fitness is more torture for her. But my roommate's figure is much better now than before. I think it's worthwhile. Fitness is a continuous process, which requires constant exercise and persistence.
And I have a roommate who doesn't exercise. He is fat. He is basically in the dormitory every day except for class, and he doesn't want to move, so it is conceivable that he will get fat slowly. In fact, everyone's physique is different. Not exercising doesn't mean he will get fat, but exercising does change a person's figure.