Dance is categorized as a performing art form involving purposefully selected movements although when I dance it's pretty random.
I also dance with random moves.
Dance can be defined by its choreography but when I dance it is basically because I hear a great song.
Choreography is quite beautiful but there is certainly something about a great song that makes you want to just move and go with it.
Other forms of human movement can be related to dance such as gymnastics, cheerleading, figure skating and martial arts.