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The theory of biorhythm starts from the fact that since birth, man, more precisely his emotional, physical and intellectual abilities pass through favorable, unfavorable and critical moments.

The best way to notice because there are days when you certainly feel good with no apparent reason or otherwise, when you have a starting point of your hands. The biorhythm concept starts with these experiences.
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Biorhythm curves describe very well the energy levels and the capacity for performance on 3 Primary levels: physical, emotional and intellectual. 
The intellectual biorhythm lasts for 33 days and relates to your mental capabilities, creativity, aptitude to solve problems. more...
The emotional biorhythm last for 28 days (just like the Moon's cycle) and relates to your emotional stability or stress. more...
The physical biorhythm lasts for 23 days and is related to your physical energy, strenght, health, stamina.  more...

Secondary rhythms: Spiritual (53 days), Awareness (48 days), Aesthetic (43 days), Intuition (38 days)

Your biorhythm above the horizontal line indicates that your capacity in that area is enhanced; you feel stronger, more alert, more connected, more empathetic. These are times when you are able to do more, be more, enjoy more. When the biorhythm lines are below 0%, your capacity is diminished, and conservative behavior is recommended. 

Very important are the points cross section - when the curves intersect above (positive) or below (negative) axis. The cross-section of all three curves has the strongest meaning and usually announces a particular event or phase (positive or negative) in which you are.

History of Biorhythms as long as 3000 years ago, the scientists of ancient Greece were recording the regular rhythms of basic bodily functions such as respiration, kidney activity, pulse rate and, of course, the female menstrual cycle.

Did you know?

Alfred Teltscher, professor at the University, came to the conclusion that his students were suffering from a "33-day rhythmic pattern". Teltscher believed that the brain had the ability to change mental ability in the 33-day cycle.