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Humans tend to swing their arms when they walk, a curious behaviour since the arms play no obvious role in bipedal gait. It might be costly to use muscles to swing the arms, and it is unclear whether potential benefits elsewhere in the body would justify such costs. To examine these costs and benefits, we developed a passive dynamic walking model with free-swinging arms. Even with no torques driving the arms or legs, the model produced walking gaits with arm swinging similar to humans. Passive gaits with arm phasing opposite to normal were also found, but these induced a much greater reaction moment from the ground, which could require muscular effort in humans. We therefore hypothesized that the reduction of this moment may explain the physiological benefit of arm swinging.
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Dynamic arm swinging in human walking

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JavaScript seems to be disabled in your browser. You must have JavaScript enabled in your browser to utilize the functionality of this website. The swing is a staple of any playground set. Kids love flying high on a swing, and they enjoy the benefits of outdoor exercise while having fun. The act of swinging can tone the arms, legs, and abs! Even adults can benefit from a good session of swinging.

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Adult woman swinging on a wooden tree swing in Mt. Hood Oregon. Concept for happiness, childlike, innocence, fun. Royalty-Free Stock Photo. Download preview.
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