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Explain the mechanism involved in the movement of arms

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it it because of the muscles and joints
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It is because of the muscles and joints present in our body and by relaxation and contraction.

felt nice helping you.
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Arm swing in human bipedal walking is a natural motion that each arm swings with the motion of the opposing leg. Swinging arms in an opposing direction with respect to the lower limb reduces the angular momentum of the body, balancing the rotational motion produced during walking. Although such pendulum-like motion of arms is not essential for walking, recent studies point that arm swing improves the stability and energy efficiency in human locomotion. Those positive effects of arm swing have been utilized in sports, especially in racewalking and sprinting.
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