문제 내용: 글의 요지를 가장 잘 나타낸 속담 또는 격언은?
  The benefits of exercise extend far beyond physical health
  improvement. Many people work out as much for mental
  and spiritual well-being as for staying fit. Can being
  physically active make you happy? Can it help you deal
  with life stress? Can it lead to a more spiritual and
  religious life? For many, the answer is yes. Exercise,
  such as walking, increases blood flow to the brain. A
  study of people over 60 found that walking 45 minutes
  a day at 6 km/h enhanced the participants' thinking skills.
  They started at 15 minutes of walking and gradually
  increased exercise time and speed. The result was that
  the participants were found mentally sharper with this
  walking program.
선택지 1: Practice makes perfect.
선택지 2: A sound mind in a sound body.
선택지 3: Experience is the best teacher.
선택지 4: Time and tide wait for no man.