听力原文：W: Exercise, exercise, exercise, we hear so much about it these days that even the experts can't agree on which exercises are best. Now some doctors are strongly encouraging arm exercises.
M: Arm exercises？ Is that because our arms are too fat of 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 as they work. Arm exercises alone aren't enough to increase metabolism before fatigue sets in. The more of a body that involves in the exercise, the better.
M: And in turn, I'm sure that there is a great 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 bicycling with special bicycles that make you use both your arms and legs, and walking vigorously while wearing arms weights.
M: I must try that. I like to walk a lot.
According to the conversation, what is one problem with arm exercises？

A. They don't get rid of flabby arms.
B. They can damage arm muscles.
C. They aren't acceptable to most people.
D. They can raise one's blood pressure.