A  man went to see a doctor. "Open your mouth ", the doctor said. The man opened his mouth and the doctor looked in quickly.   "It's clear what's wrong with you .You need more exercise, " the doctor said.  "But doctor," the man said "I don't think ..." "Don't tell me what you think," " I am the doctor, not you. I know what you need  . I see hundreds of people like you. None of them get any exercise. They sit in offices all day and in front of theTV in the evening. What you need is to walk quickly for at least 20 minutes a day" "Doctor, you don't understand ," the man said, "I..." "I don't want to hear any excuses," the doctor said , " You must find time for exercise .If you don't  you will get fat and have health problems when you are older." " But I walk every day ,"the man said. "Oh, yes , and I know what kind of walk that is .You walk a few feet to the train station from your house, a few more feet from the station to your office, and a few more feet from your office to a restaurant for lunch and back. That's not real walking .I'm talking about a walk in the park for twenty minutes every day."" Will you listen to me , doctor !" the man shouted, getting angry with this doctor who thought he knew everything. "I m a postman"., the man went on, " and I walk for seven hours every day! It's my wife, she is ill." The doctor thought many people had health problems only because they  _
did not have enough exercise didn't like walking spent much time watching TV. were working in offices