Scientists know why we swing our arms


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The subject has baffled scientists, since there is no obvious reason why we do it.

Biomedical researchers at the University of Michigan say it makes walking more efficient and easier. Using a mechanical model, they found that holding the arms still required 12 percent more energy than swinging.

Swinging arms it also makes life easier on the legs.

Holding your arms still increases your contact with the ground by 63 percent.

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