Rises and falls
Rises and falls is a category of the ballroom dance technique that refers to rises and falls of the body of a dancer achieved through actions of knees and feet (ankles).
This technique is primarily recognized in International Standard and American Smooth dance categories. Rises and falls are important in Waltz, Foxtrot, Quickstep, and Viennese Waltz. Tango is described the "level" or "flat" dance, and its basic technique specifically eliminates rises/falls in the overall motion, with the exception of certain advanced figures and styles.
The expression "rises and falls of the body" is a rather vague one, and in attempts to be more precise some texts refer to center of gravity, rather than body. This may also be misleading if taken out of context: the center of gravity may be lowered, e.g., by bends and sways. In addition, a certain amount of body rise and fall may be achieved by hip action, used in Latin dance, but absolutely proscribed in Standard and Smooth.
Rises and falls of the body is a natural phenomenon during casual walking: when feet are apart the body is closer to the ground than when the feet are together. Some dances, e.g., Charleston, exaggerate this natural "bobbing", while in many others bobbing at each step is considered to be bad style or lack of proper technique.