These cycles start at a middle point when we are born and then go up and down at different rates over our lifetimes. When any of the cycles are at a high point, things we do that require aspects of that trait are more successful - the reverse is true during the low points of a cycle. When they undergo the transition from positive to negative or vice versa, they are said to be critical.

The Physical Cycle
The Physical cycle is 23 days long and typically influences physical factors. For example: - eye-hand co-ordination, strength, physical endurance and resistance to ailments and disease. Don't undergo surgery on physically critical days, similarly if you are a Doctor, avoid planning operations on physically critical days. Watch out for accidents on critical days and be careful when using dangerous equipment If you are on a physical low, take plenty of rest, get plenty of sleep and take things easy.

The Emotional Cycle
The Emotional cycle is 28 days long and typically influences emotional factors for example : - love hate relationships, elation and depression,optimism and pessimism, passion, tenderness etc. When your emotional cycle is high you will have plenty of positive emotional energy, it is a good time to plan tasks like giving a good speech or clinching an important deal Don't make any critical decisions on emotionally critical days, they could be wrong! When on an emotionally low day, don't pay too much attention to negative feelings, you will find that they will change when on a more positive day.

The Intellectual Cycle
The Intellectual cycle is 33 days long and typically influences factors like: - money, reasoning ability, alertness, accuracy, learning ability. When your intellectual cycle is high you will have plenty of positive intellectual energy, it is a good time to plan tasks which require lots of mental ability, quickness, problem solving, programming, taking exams or interviews etc. On intellectually critical days, your mental performance could be brilliant or it could be terrible. Do routine work on days when your cycle is low, do not expect miracle problem solving when you intellectual biorhythm cycle is low.