Feeling ecstatic? Sad? Energized? Unmotivated? But you don\\\'t know why? Could be your biorhythms! Enter your birthdate and see your biorhythmic state today. Want to see how you might feel before a big meeting or date next week? Type in a future date. According to biorhythm theory, our lives are affected by three primary cycles: Physical, Emotional, and Intellectual. The cycles start at a middle point at birth, and then go up and down from this point at different rates over our lifetimes.