"Cha Cha" movement is counted as slow, slow, quick-quick, slow. Its probably better to think of the movement as Rock, Rock, Side-Close, Side.
The name "cha-cha" first appeared in Haiti, where it was the name of a component of a bell. This bell was made from a plat that made a "cha-cha" noise when rubbed. Haitians quickly learned to use the bell element as an instrument to keep time as well. The "cha-cha" was, therefore, probably the first metronome to hit Haiti.
The cha-cha was actually created from the mambo, when it toured America. Several audiences complained that the mambo was too fast and jerky for their taste. Orchestras began slowing it down, and the cha-cha was created from this new beat. Therefore, the cha-cha is a mambo, slowed down about three times! Since the mambo was a fusion of jazz and Lain rhythm, the cha-cha retains these qualities. It is a sensual, energetic dance.
Prerequisite: A great attitude and an open mind to learn the art of cha-cha dancing!

