humans physical structure is well-built for running long distances, especially in hot summer. Because human is unique in the running ability. First, people can sweat through the sweat glands to protect bodies, it is better for runners keep cooling and in case of hyperthermia. Second, it is easily for our sweat evaporates due to we do not have any fur on our skin. In addition, our head is linked with the spine by a piece of anatomy and we can run without heads bobbing up and down. It is important for…
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