About Doing Physical ExercisePhysical exercise is very important 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 up our bodies and improve our health. 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 quickly. For example, playing table-tennis can make you respond faster. In a word, exercise is helpful, important and necessary.