The performing arts differ from all of the other arts because of immediate participation from the audience.
Dancing requires great physical skill and control over the whole body.
The control includes grace, strength, ease of movement, and fluidity between movements. This is all achieved within the limits of music and in final performance, to a central choreographer and dramatic plan. The instrumentalist must spend large parts of his life acquiring, mastering, and maintaining control over his body in the interest of his ears and musical intelligence. As for singing, the control of the body is centered in the mouth, the vocal chords, chest, and the diaphragm. Each of these four types of performances has its own different qualities that may appeal to some people and not to others.