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".
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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
单项选择题
At what age should people be introduced to jogging as an exercise
A．At puberty.
B．During childhood.
C．Daring adulthood.
D．During old ag
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