Biorytm

Biorytm is a Biorythm program for the Amiga created by Grzegorz Szymczak and Krzystof Pichlak in 1994. Biorhythms are a cross between technology and astrology except using your body as the effective heavens, it purports to help you track biological cycles that some believe affect a person's daily life, moods, and behavior. The theory of biorhythms is considered pseudoscientific, and many (all sane) scientists are skeptical of it.

The length of each cycle is the same for everyone, but the timing of highs and lows varies based on birth date. Some (the dupes) believe that biorhythms can help people plan their lives around their cycles. However, studies have found that the predictive power of biorhythm charts is no better than chance.