单项选择题

Questions 8 to 10 are based on the following conversation. At the end of the conversation, you will be given 15 seconds to answer the questions.
Now listen to the conversation.

What form of exercise does the woman mention

A.Wearing arm weights while you are swimming.
B.Jogging vigorously in one place for a long time.
C.Using bicycles that require you to use both your arms and legs.
D.Walking slowly while swinging your arms back and forth.