A lot of time is spent inventing new dance moves and editing routines. Choreographers need to have a good ear for music, as they have to listen intently to the piece of music being used and create dance routines that work with the production or performance.
Choreographers work very closely with dancers, teaching them by example and by spoken instruction. A choreographer may spend weeks or months providing direction and encouragement to the dancers, inventing and arranging the choreography, and of course making the necessary changes and tweaks to perfect the dances. Needless to say, there is endless practice involved.