Biorhythms were a fascination of mine in the 70's. The premise is that when a person is born, three basic cycles begins. They relate to the person's physical, intellectual, and emotional states that rise and fall based on a given cycle of days.
Each cycle has a high, low, and critical point that can be compared to anothers biorhythm. Followers of this psuedoscience would schedule their days based on the state of their specific biorhythm.
Use this form to generate a chart of your biorhythm levels over a period of 40 days, begining 20 days ago.