Since coming to understand her bond with Echelon, Natalie's learned that most of her skills- especially extracurricular- are borrowed. There's one thing she didn't have to borrow, however, and that is gymnastics. She found an interest in it as a young child, enjoying the thrill of being upside down and turning and jumping and tumbling. The very physical nature of the discipline also gave her a sense of focus that would later help her learn more offensive skills.
Nat grew to be quite good at it- so much so that even today she has a dexterity well above average. However, as she entered her teen years, it began to dawn on her how... insufficient leotards could be. She rationalized it as wanting to do other things, but every now and then, she does miss the balance beam and parallel bars.
Here we see Natalie apparently deciding to put the uniform on for old time's sake. Carrie is wont to cheer her on for reasons both wholesome and not, but Mr. Surftide- the master of morale- could make the Chess team feel like champions.