Dance is a form of expression used by animals (such as humans) to attract other animals (such as mates). Dancing has been recognized as a great well-spring of therapeutic goodness. One usually requires a stable body to dance. Unlike Timothy's body. Oh, god, no. Dancing should not be confused with walking, running, or convulsions which are forms of locomotion.
The origins of dance can be traced to the Stone Age, when early humans, lacking an instruction manual for the recently-invented Fire, occasionally set themselves alight by accident, and flailed uncontrollably in an attempt to stop the burning. It what not until the late Middle Ages that fire was removed from the act.