4. Work and rest balance: a healthy state with appropriate exercise and rest of the human body.
According to The Medical Classic of the Yellow Emperor, people fatigue on five occasions: watching long harms the blood, sleeping long harms the qi, sitting long harms the flesh, standing long harms the bone, and walking long harms the tendons. No one can avoid these five states, so we should try to arrange appropriate exercise and rest to ensure good health.
Exercise balance. Life lies in movement. If one does not do any exercise for a long time, his blood circulation will lack invigoration. One being satiated with food all day, the supply to his body will exceed the needs, then high blood pressure, hyperlipemia, and hyperglycemia and other adiposity diseases might develop. Keeping on exercise helps build the heart, increase the vital capacity and accelerate the blood circulation, thus strengthening the immunity functions, muscle development and joint flexibility, increasing the appetite, making people feel relaxed and happy, and facilitating the adjustment of the nervous centralis and the normal operation of the biological clock. However, it’s not that the more exercise, the better. Excessive exercise will cause damage and maladjustment to human organs and further lead to diseases. So, we should weigh the advantages and disadvantages and do adequate amount of exercise.
Too much enjoyment will result in degeneration. Take the hare for instance. Wild hares can live as long as 15 years, but the life span of domestic hares is only 1/3 of that. Elephants can live 200 years in the wild, but no longer than 80 years if they are fed in a pen. Modern life has brought us endless ease and enjoyment, but excessive enjoyment is no good to human beings. People reluctant to do exercise may not know that their "sitting still" all day is a virtual “waiting for death”, as more than 2 million people die of this every year around the world. So, many die not of disease, but of ignorance and of their unscientific lifestyles. Scientific lifestyles help prevent nearly 60% of diabetes. Keeping a balance of work, rest and diet, and appropriate amount of exercise will save 1/3 people from cancers.
In effect, excessiveness is never a good term for either rest or work. Rational lifestyle is the sole key to good health.
Sleep balance. Sleeping is a way to supply energy to the body. According to the theory on “correspondence between man and universe”, the direction of sleeping position affects people’s sleep and health. This is because the earth is a huge magnetic field while human body is a small one, and the large one influences the small one at all times.
Sun Simiao, a renowned doctor of the Tang Dynasty (618-907), noted that a sleeper should lie with his head toward east in spring and summer, and west in autumn and winter. Other experts on health preservation hold that it is better if one lies with his head toward east all year round as the east represents the masculine and positive yang. But still some argue that direction for sleeping position should change as the seasons change. Our study has revealed that it is better to sleep with one's head toward east, and the choice of quilts, pillows and length of sleep should comply with local customs.
Anyhow, work and rest balance is the balance of storage and consumption of the human energy. Either work or rest should be kept within certain scope so as to live a happy and prolonged life.
Five beauty tips: physics, diet, psychology, sleep and exercise.