The three primary biorhythm cycles are:
The 23-day physical cycle tracks the man's strength, endurance, powers and state of health.
The 28-day emotional cycle tracks the stability and positive energy of your psyche and outlook on life, as well as your capacity to empathize with and build rapport with other people.
The 33-day intellectual cycle is representative of man's intellectual dynamics: verbal, mathematical, symbolic, and creative abilities, as well as your capacity to apply reason and analysis to the world around you.
Additional rhythm
The 38-day intuitive cycle was discovered later and can’t be considered as a primary one. However it may be useful to know when you can trust your "sixth sense". The cycle tracks an unconscious perception and instincts.
The three secondary cycles that derive from the primaries are:
Mastery biorhythm comes from interaction between the Intellectual and Physical cycles. Mastery encompasses your ability to succeed at tasks and to obtain what you desire. This cycle also tracks athletic ability and the focus required to learn physical skills.
Passion biorhythm is the combination of the Physical and Emotional cycles. Passion encompasses your motivation to act, and the drive that allows you to continue a difficult pursuit. This cycle also tracks sexuality in its purest form and affects enthusiasm, stimulus, and impulsion.
Wisdom biorhythm is created by interference between the Emotional and Intellectual cycles. Wisdom encompasses your understanding of the world, your role in it, and the things that are truly important to your life. This cycle also tracks the presence of mind that you need to make crucial decisions.
Biorhythms: Extra rhythms (Intuitive patterns)
The three extra cycles that derive from the primarie cycles are:
Perception - comes from interaction between the Physical and Intuitive cycles.
Psychic - is the combination of the Emotional and Intuitive cycles.
Success - is created by interference between the Intellectual and Intuitive cycles.
The Physical/Intuition pattern is probably the hardest of the basic patterns to name. That's probably because Physical and Intuition are diametrically opposed on the surface. On the contrary, they are the same as all extremes meet. Physical covers the 5 basic senses that everyone is aware of and Intuition embodies the ethereal (electromagnetic) senses that are just beyond the reach of conventional science. Many plants and animals on this planet have been proven by science to have perceptions beyond that which most people realize, and untold unsolved crimes have been solved with the help of Psychics. This pattern was named the PERCEPTION pattern for obvious reasons.
Emotional/Intuition is the PSYCHIC pattern (ESP, Precognition, Remote Viewing, etc.), and Intellectual/Intuition is the SUCCESS pattern (Business, Financial, Scientific discoveries, etc.).