All about hobbies

What Hobby Is Simple And Interesting To Take Up?

I have a friend who has been overworked and overstressed and basically got to the point that she doesn't think anything else other than how bad things at work is. I think she is getting depressed about the situation but she doesn't admit it. Please help me find an easy hobby she would live to do in order to take her mind away from work, and have something interesting to do.
I am open to all suggestions.