To run far, fast, and efficiently, you have to run with proper posture. Keep your shoulders back and your arms bent 45 degrees at the elbows. Allow your arms to swing freely, but don’t let them cross the vertical plane bisecting your body. This will create balance, open the chest, and encourage deep breathing.
Lean forward, but not at your hips. Lean at your ankles. Imagine a rod running from your head to your heels. Keep the rod at a slight forward angle to the ground. When your entire body participates, you’re using gravity to your advantage.
Remember. Running is controlled falling.