(Shirley and Benjamin are jogging)
Shirley: Come on, you are left behind!
Benjamin: Wow, I can't catch my breath. You are running too fast, honey.
Shirley: You just need more exercise.
Benjamin: Yes, but you need to slow down. This is jogging, not racing!
Shirley: I don't care. I want to burn up my fat.
Benjamin: But running so fast is not good for people over forties.
Shirley: Why?
Benjamin: We are not as athletic as we were when young. Mild exercise is more suitable for us.
Shirley: But I want to burn up more calories!
Benjamin: In fact, in order to burn up your fat, you must take it slowly for a longer time.
Shirley: Really? I will slow down then.
Benjamin: That's right, honey. Oh, you don't need to be as slow as a tortoise.
Shirley: I don't care.