Poor running form is a major cause of injury and inefficiency in both amateur and professional runners. It is very easy to record yourself using iPhone/android apps like Coaches eye (http://www.coachseye.com/) and do your own analysis using the basic principles of good form. It is the easiest way to get quicker and stay injury free.
“poor running technique” courtesy of MarathonGuru
“Simple” Steps can improve efficiency and more importantly reduce your risk of injury. This video shows a vast improvement in the same runner however in my opinion the runner is continuing to overstride particularly on the left!
“Improved running technique” courtesy of MarathonGuru