文章献给准备过英语专业四级的同学，给同学一点写作素材，希望大家考试成功。
How to Keep Fit
A healthy body is very important to every one of us. When you are sick, you feel painful all over your body, have no energy to work; and the only thing you want to do is lying on the bed. When you are healthy, you can eat well, sleep well, sing and jump happily, do all the things you like to enjoy life.
The methods to keep us fit vary. In the morning, you can get up early, go outdoors, breathe the fresh air, and do physical exercises. Running and swimming are extremely helpful to keep one fit. If you are a busy person and have no special time allocated to do these things, there are still some ways useful for to keep fit. The easiest way is to walk to your office instead of riding a bike or taking a bus. You also have to take a routine physical check - up. Your doctor will know the condition of your body most clearly, and he will give you the most valuable advice to keep fit. You should always try to make yourself happy. If you feel happy, you can eat well, sleep well, and your body is sure to be in an excellent condition.
Health is the most valuable possession a person expects in his life. Try every means to keep fit is my advice to the people who want to live a happy life in this beautiful world.
The Importance of Physical Exercise
Everyone hopes to live happily in the world. Physical exercise is indispensable to a happy life. There is a famous saying: "Life lies on exercise." Although you will not necessarily die without regular physical exercises, they' II certainly help you live longer and more healthily.
Exercise is good for us to build our bodies. It helps co - ordinate the different parts of our bodies when we have sports. For example, we must try our best to co - ordinate the movements of the arms and legs when we play basketball, or we won't be able to shoot the basket. Exercise also benefits our organs. It lets the heart beat faster than usual, and then helps enlarge the blood vessels to protect us from heart attacks.
Exercise can also contribute to the development of our ability to response agilely. For instance, when you play table- tennis, you must try to reflect as quickly as you can so that you may fight back at the right position at the fight moment.
Exercise can also contribute to improving our mood. When you do exercise, you move a lot, and you have to be more active. It helps you become more optimistic.
Exercise will fill your life with various contents and make it more colorful.
What's more, exercise will help you get rid of your inertia. If you keep doing exercise regularly, you will never be a lazy person. Therefore, exercise has great effect on one's character.
In a word, exercise is helpful, important and absolutely necessary.
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