A、Because his arms are too fat. B、Because his muscles are not firm enough. C、Because it is an ideal way to keep physically fit.

M: Exercise, exercise, exercise. We hear so much about it these days yet even the experts cannot agree on which exercises are the best.
W: (19)However, you see, we do need exercises because we are getting lazy for keeping fit, and the health strength exercises And all of them can give the full reasons for their support. Now some doctors are strongly encouraging me to do arm exercises.
W: Arm exercises? Is that because your arms are too fat or flabby?
M: Actually, that’s not the main reason. (20) They say that arm exercises are an ideal way to become physically fit.
W: But don’t arm exercises raise your blood pressure?
M: They do, But the article I read mentions ways to make up for that.
M: (21)By adding leg exercises, so the arms don’t do all the work. Arm exercises aren’t enough. It is said that the more of the body that involves in the exercise, the better.
W: And in turn, I’m sure that there is a greater chance of losing weight.
M: Sounds right to me.
W: So. what exercises do the experts recommend?
M: They mentioned quite a few. (22)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.
W: I must try that. I like walking.