Wow... you can notice that the way Danny Dreyer run, is like the ancient steamed powered automotive, so natural. The videos below are very useful for runners, he teaches a runner how to run naturally (with shoes),
How to avoid heel strike!
Running Posture (Fundamental and very important)
Cadence (Number of strikes per minute)
I sincerely hope everyone is benefited from this sharing. Have a healthy life, do sports, walking or running.