that's just how we swing

Via TSH,
Ever wonder why we swing our arms when we walk? Is it just a left-over trait from when we were on all fours?

Well, some researchers were interested in answering that question. They found out that swinging arms wasn’t quite the waste of energy most had assumed. In fact, holding your arms by your side while walking requires 12% more metabolic energy.

Why do I see a future infomercial on the handcuff calorie burning plan?

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