CMP Biorhythms is a small application which calculates and displays biorhythm graphs. Enter your birthdate and this Applet and it will calculate your biorhythms.   It computes your 23-day physical, 28-day emotional, 33-day intellectual and combined cycles. The combined cycle is sometimes called the luck cycle. The theory of biorhythms is when the cycles are positive/high you will have high energy. When they are negative/low you will have low energy.