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The biorhythm theory, first developed in Switzerland, is based on the belief that the human body operates on three constantly‐recurring cycles — the physical, which is a 23‐day cycle; the sensitivity (or emotional) cycle of 28 days; and the intellectual (33 days). The physical rhythm influences resistance to disease, strength, co‐ordination, speed, and physiology. The emotional rhythm influences creativity, sensitivity, mental health, and general mood. Intellectually the influence is on memory, alertness, logical and analytical functions. At birth each cycle starts at a neutral baseline, or zero point. From there it begins to rise in a positive phase, during which the energies and abilities associated with each cycle are high. For the first half of its duration the cycle rises gradually to a peak, then goes into a decline.