听力原文：W: Exercise, exercise, exercise. We hear so much about it these days yet even the

M: Ann exercises？ Is that because our arms are too fat or flabby？

W: Actually, that's not the main reason. They say that arm exercises are an ideal way to become physically fit.

M: But don't arm exercises raise your blood pressure？

W: That they do. But the article I read mentioned ways to compensate for that.

M: How？

W: By adding leg exercise so the arms don't do all the work. Ann exercises aren't enough to increase metabolism before fatigue sets in. It's said that the more of the body is involved in the exercise, the better.

M: And in turn, I'm sure that there is a greater chance of losing weight.

W: Sounds right to me.

M: So, what exercises do the experts recommend？

W: They mentioned quite a few. But some of the more popular ones are cycling with special bicycles that make you use .both your arms and legs, and walking vigorously while you wear arm weights.

M: I must try that. I like to walk a lot.

Why do people need to do arm exercises？

A．Because their arms are too fat.

B．Because their arms are too flabby.

C．Because arm exercises can help lower the blood pressure.

D．Because arm exercises can keep them healthy.