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新一轮中考复习备考周期正式开始， people want to have good health.what is good health?you are feeling strong and well.your eyes are bright and clear.your face is clean and fresh.you feel happy and ready for anything. you enjoy your work and life.you are in good health.exercise is one of the forms to keep our body in good health.exercise trains the muscles and makes them stronger.you can walk and throw a ball because you have trained your muscles to do these things.feel the soft part of your arm.you are feeling muscles.when you bend your arm you can feel the big muscles move and become firmer.exercise not only keeps the muscles of the limbs and body in good condition,but also strengthens the muscles of the heart and organs of breathing.exercise helps to make the heart strong.have you ever felt your beat? it beats faster when you are running than when you are sitting still.the heat pumps blood more freely when we do exercise,and serves all parts of the body better.exercise helps the lungs to do better work.too full and rapid breathing develops the muscles of the chest.let‘s take part in exercise.the earlier,the better. (责任编辑：admin) |