Question 28to 31are based on the following passage.

Regular exercise can help you build stronger muscles,shake off illnesses?and make your clothes fit a whole lotbetter. But there’sanother benefit:even moderate exercise www.docin.com 10 seems to take years off your age. Of course, you cant changeyour age, but exercise can improve your health so that youlook and feel younger than you are.

Exercise gives you more energy. Exercise fires up yourbrain and body so you feel more energetic.

Exercise puts your body in a state of excitement,whichmeans more vitality and a greater sense of well being. Dailytasks become less tiring and require less effort. It’s the kindof energy that makes you feel like you are a decade or twoyounger.

Exercise keeps your skin soft and glowing. Researchersstudied a small group of adults between ages 20and 84. Thefrequent exercisers who were over age 40had skin thatresembled the younger skin of people in their 20s and 30s.The difference had nothing to do with sun exposure, whichwould age your skin faster, reported the research team, theyguess that exercise creates body substances that help slowaging in skin, though they say more research is needed tolearn how exercise works.

Moreover,exercise helps you sleep soundly. Restful sleep islike a fountain of youth, and exercisehelps you achieve it. Research shows that regular exercisers fall asleep more easily and are more likely to7experience deep sleep. Exercise tires you out,sure,butthere’s v more to it than that. Sleeping well helps all thesystems in your body function optimally,so d you’re lesslikely to suffer sleeplessness. A recent study finds that gettingat least 150minutes of exercise per week improves sleepquality by 65%. 

 28.What do we know about sun exposure according to thepassage?