Read the following conversation and answer the question.

W: Hi, Jack, have you thought about your ideal job in the future? Do you want to be an excellent math teacher like your father?

M: For Gosh's sake! I hate being a teacher. I still have a clear memory of the terrible days when my father helped me with all my subjects. But it is strange that I made great progress in my English learning. How about you, Jessica?

W: Well, I dream of being a brilliant dancer like my mother. You know, she is 43 now, and she has been dancing since she was 20 years old.

M: I can't believe it! She looks quite young and has a great figure.

W: Yes. She has formed a good habit of having enough fruits and vegetables every day. And more importantly, she keeps an optimistic attitude towards life which benefits her physical condition.

M: Oh, I see. How I wish I had taken enough exercise.

W: Come on. Don't lose heart! If you think you can, you can. Let's get rid of our bad habits and learn from our great parents.

M: Why not do it right now? Shall we swim this afternoon?

W: With pleasure!

Question: Jessica's mother is in good condition, and what contributes to this more? 

- Having an optimistic attitude towards life.

- Fruits and vegetables.

- Taking enough exercise.


Having an optimistic attitude towards life.