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Mike : ⓐYou're in a pretty good shape.

Sarah : Thanks.                                 

       I take an aerobic class three times a week.

Mike : Good for you. I don't exercise at all.

Sarah : If I were you, I would exercise hard.    

       It feels great.

Mike : I know it's my big problem.

Sarah : Why don't you start to jog?

Mike : Jogging? It's a good idea.

       I'll start to jog tomorrow morning.

Sarah : Good luck to you.

1. What does Sarah do for physical fitness? (세 단어)