Graphs can be developed to chart these cycles and predict when one's best and worst physical, emotional, and intellectual days are alleged to occur. When one's best days for all three cycles coincide, one should perform at the peak of one's physical, emotional, and intellectual powers. When one's worst days for all three cycles coincide, staying in bed might be a good idea. Unfortunately, the system does not work. Biorhythm graphs based on the birth dates of athletes, for example, cannot predict the athletes' actual performance.
Athletes do as well on supposedly bad days as they do on supposedly peak days.
Sources George O. Abell, et al., eds. Science and the Paranormal . James A. Fix. Pseudoscience and the Paranormal.