In addition, a strong core will allow you to keep your torso stable, and according to the New York Road Runners (NYRR), a strong core and solid torso “means eliminating unnecessary and counterproductive movements that waste energy and aligning the head, hands, knees and feet to face forward. Avoid these common inefficiencies: head bobbing, head shaking, body swaying, body twisting, knees and toes pointing inward or outward, and the hands angling inward.”
