RUNNING HACK: ELBOW DRIVE
Do this to speed yourself up.
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If your elbows jut out or your forearms cross the midline of the body as you swing them back and forth, you’re wasting energy, Schwarz says. Instead, they should reach straight back when the opposite leg and hip move forward, and straight ahead when the opposite leg and hip move behind you.
To get used to how it feels, exaggerate the motion while marching in place with high knees or while doing split-lunge jumps. Keep a 90-degree bend in your elbows at hip-height and relax your shoulders and fists, notes Schwarz.