The Tune-Up: Stand and Deliver
Andy Potts' key to a fast run? Stay tall. Greg McMillan, of McMillan Running in Flagstaff, Arizona, explains how to avoid hunching over, for a more efficient stride.

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POSTURE
Stand against a doorframe and bend at your ankles four to six degrees. This is the position you should maintain as you run.
STRIDE
Overstriding can cause heel strikes and waste energy. Your feet should fall beneath you, with your head, shoulders, and hips aligned.
ELBOWS
To avoid a hunched position, keep your elbows tucked at your side and swing your arms in a straight line, thumbs pointed slightly outward.