kpop1-5, Exercise 2: Choreography

Model answer:

Formation changing (자리바꿈, jaribakkum): when several singers perform together they often switch positions while singing and dancing, using prompt movements in synchrony.
Point dance (포인트 안무, pointeu anmu): a dance made up of hooking, repetitive movements within the choreography that match the lyrics. Examples given: Super Junior's "Sorry Sorry" and Brown Eyed Girls' "Abracadabra" (either one is enough).
Simplification: the article cites choreographer Ellen Kim as saying that a fan's ability to do the same steps must be considered, so choreographers have to simplify movements.

Note: the choreographers quoted describe their own work; their accounts are not a description of every group.

Source: Wikipedia, K-pop (Dance).