The coordinated movement of the arms while running, typically involving a forward and backward motion that counterbalances leg movement. Proper arm swing helps maintain balance and contributes to running efficiency.
From Old Norse 'armr' and Old English 'swingan' meaning to move rhythmically. The term became prominent in running coaching vocabulary in the early 20th century as understanding of biomechanics improved.
Your arms are like the conductor's baton for your entire running rhythm - they set the tempo for your legs! Elite marathoners have such efficient arm swings that they barely waste any energy on unnecessary side-to-side motion, channeling every movement into forward propulsion that can save precious seconds over 26.2 miles.
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