A biorhythm (from Greek βιορυθμός - biorhuthmos)'s a hypothetical cycle in physiological, emotional, or intellectual well-being or prowess. "Bio" pertains to life and "rhythm" pertains to the flow with regular movement. Biorhythms theory has no more predictive power than chance and has been labeled a pseudoscience by skeptics. Basic theory Basic rhythm details: Physical cycle 23 days; Circavigintan coordination strength well-being Emotional cycle… (More on Biorhythm)