Short description of 1st Biorhythm 4.1: Having a bad day? Feeling unmotivated? But you don't know why? Check out your biorhythms today! Be prepared for the Critical Day before it comes! Plan your activities with 1st Biorhythm to achieve maximum efficiency! Our lives are affected by three primary cycles: Physical, Emotional and Intellectual. The 1st Biorhythm will provide you with a comprehensive information and analysis about 7 biorhythm cycles.