Is a skinny cheerful girl who does the work she needs to do, but much prefers adventure. The uniqueness of her name mirrors how unique she actually is. Most people have lots of Kaitlyn's in their repertoire of friends, but one must be very lucky to have a Kaitryn. Furthermore, she's a vixen with her fellows, and has mad dance moves that she enjoys showing them off at random places.
That girl doesn't need to be at the gym, she's a total Kaitryn.