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There is no single prescription for efficient running; we are all put together
differently. There are general principles of body form that can be applied to all
runners. Be sensitive to your own structure and abilities and never force a
particular running style on yourself that doesn't feel right. The main function
of the arms is coordination with the legs. At the completion of each arm swing,
a nerve signal tells the legs to work again. When held in a relaxed swing fairly
low and close to the body very little effort is required to keep your arms in
place and you'll tend to get a quicker response from your feet. But if you hold
your arms out from your body, your arms and shoulders will tire quickly.
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