2011/12/7

           It’s very cold and windy today. The outside air is better than yesterday however. I swam half an hour with one of my colleagues after having the lunch. I felt very comfortable after sporting, but the exercise was not enough. If I could swim twice or third a week, I should feel better. Most of the worker has some trouble in the cervical vertebra or the lumbar vertebra. It is a common kind of the sub-health. There is not a good idea to treat the sick, we should do more exercise and keep at the sub-health.