Why does the man need an outside interest?

M: My doctor says I need an outside interest to get my mind off my work.Can you suggest a hobby?
W: Yes,I can suggest a hobby.Electronics might be fun,but you don’t want a hobby that requires a lot of expensive equipment,do you?
M: No,I don’t want to buy expensive equipment.I just want to do something that is relaxing and enjoyable. Do you think collecting umbrellas would be interesting?
W: Collecting umbrellas! I’ve heard of a lot of unusual hobbies,but I’ve never heard of that one. You don’t play a musical instrument,do you?
M: Yes,I play the violin,but I want to do something different.What’s your hobby?
W: My hobby is stamp collecting.I’ve just started collecting stamps and it’s a lot of fun.Have you ever had a stamp collection?
M: No,I’ve never had a stamp collection.It takes a long time to build a good stamp collection.doesn’t it?
W: Yes,building a good collection takes a long time, but a rare set of stamps can be very valuable. I can see that you’re not interested in stamp collecting,but how about spots?
M: Yes, I am interested in sports.I want something I can do on weekends.Do you think golf or tennis would take my mind off my job?
W: Yes,I think they would.