1 . We all need physical exercise. Exercise uses up food we eat and keeps the body energetic. If you exercise several times a week, you will stay happy and healthy.

Some Western countries, such as the United States, have problems with exercise. In the US, many people don't have enough exercise because it is hard for them. People have to work from morning to late afternoon, so they don't have time to take exercise. They work in office buildings sitting in chairs all day long in front of computers. It is impossible for them to get much exercise in this way.

Some Westerners can get exercise walking from their homes to work. However, most of people cannot do this. It is too far from their homes to their offices. They have no choice but to drive to work. In fact, some have to drive one or two hours to their offices. This is not good in two ways. First, these people don't have a chance to exercise because they are sitting in their cars for two to four hours each day. Second, driving is challenging especially in rush hours and needs too much attention. It makes a person very tired. So, when these people arrive home at night, they don't want to take exercise after work.

Today, many people in the West are overweight which causes health problems for them. Doctors say exercise can help people both lose weight and improve their health. So many people are trying to get more exercise. But it takes time to change, and when people don't see a difference right away, they will lose confidence and stop exercising.