单项选择题

When jogging, what should one not do with one's eyes

A．Look ahead.
B．Look at one' s feet.
C．Blink.
D．Look to the sid
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单项选择题
Which of the following does jogging not do
A．Strengthen the breathing muscles.
B．Condition the heart.
C．Build strong shoulder muscles.
D．Promote a "training effect".
单项选择题
What is the best way to land on your feet at each step
A．On the heel of the foot.
B．On the toes.
C．Flat footed.
D．It is not indicate
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