Why do you think we swing our arms when we walk?

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Have you ever wondered why people we see walking around us, may it be on the street, catwalk, pavements, inside buildings, at the gym, and pretty much everywhere always swing their arms when they walk. Even yourself you may never had thought what could be the reason why your arms are swinging as you walk to place you wanna go. Some biomedical researchers have been curious about what causes our arms swing when we walk. They were amazed by the dynamics it can contribute to walking so they tried to make a research about it. They built a mechanical model to get an idea of the dynamics and functions of arm swinging. Included on the research were subjects consist of 10 people which were divided into two groups. The first group were asked to walked on the normal arm swinging way, while the opposite group were told to walk with their arms held back or folded. Results were derived and the dynamics of arms swinging while walking has a garnered some answers to it. How about you, what do you think is the reason why our arms swing while we are walking? Would there be a purpose for it? Kindly share what you think.