听力原文： Do you find yourself feeling fired all the time although you get enough sleep？ Then maybe this is for you. When you're feeling weak and fired, the worst thing to do is to take a nap. It won't restore your stamina. On the contrary, what happens then is your body loses even more energy than it had before, making you even sleepier.
You may also have these poor habits that worsen the problems. Do you stay in the same small area without getting up to move around？ Does your job require that you sit dawn the whole day in front of a computer？ Any or all of these reasons might be the cause of your energy loss, keeping your energy level low.
What should you do, then, at those moments when you feel so tired even though you've got enough sleep？ A cup of coffee won't help much either, as it is easy to get addicted to the caffeine. The best and most natural thing to do is to take a brisk walk. Doctors recommend the activity because it will increase the heart rate. This increased heart rate will lead to several hours of alertness. Moreover, a regular exercise routine can make your fatigue problems disappear forever.
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A. Your heart rate increases.
B. You become even more tired.
C. You solve the fatigue problem.
D. You'll get hungry.