An Overview and History of Biorhythms, narrated by host, K. David Katzmire from the web page on this subject at: http://kalarhythms.org/biorhythms/ .
Discussed are; the 23-day Physical Cycles, the 28-day Emotional Cycles and the 33-day Intellectual Cycle . Early theories from antiquity and the classical Greek era that led to the theory of biorhythms are noted. Ground breaking work from the late 19th and early 20th century are described with the works of: Dr. Hermann Swoboda, Dr. Wilhelm Fliess, Alfred Teltscher, Dr. Rexford Hersey & Dr. Michael John Bennett.
Additional biorhythms are mentioned with the theories of a 38-day, 43-day, 48-day and 53 day biorhythms with special mention to author Mort Gale.