The theory of biorhythms claims that one's life is affected by rhythmic biological cycles,
and seeks to make predictions regarding these cycles and the personal ease of carrying
out tasks related to the cycles.
These inherent rhythms are said to control or initiate
various biological processes and are classically composed of three cyclic rhythms that
are said to govern human behavior and demonstrate innate periodicity in natural
physiological change: the physical, the emotional, and the intellectual (or mental) cycles.
Some proponents think that biorhythms may be potentially related
to bioelectricity and its interactions in the body.