What is the reason we bend out arms when we run, but hold them straight when we walk?
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When I was doing long distance running in high school and college back in the 1990s we were taught to keep our arms relaxed and to swing them with the wrists at about waist level. This was all about conserving energy and it made it easier to take longer strides. When we got near the finish we could swing our arms at chest level which helped us move faster. I’m talking bout 10+ mile runs. It could also be complete bullshit but that is what we were taught back then
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