I have been harping on my running clinic and everyone i see running and will listen about running form. WE ARE BORN TO RUN. The human body is designed to run , and run long distances. Like 99% of injuries are caused from poor form. Now, this poor form will only bother you have the repetition of thousands of steps. So, sitting on the couch being sedative will not cause you any pain. But, running can. Unless you have proper form. Thus landing on the balls of your feet with a slightly bent knee, with your ankle, knee, hips, chest and head all in straight-line. To explain it better I found an excellent analysis on You tube. Check out the link to see a great break down of perfect running form as demonstrated by elite kenyan’s.
http://www.youtube.com/watch?v=5r3_sKkHnTU
Enjoy,
Steve
I identified this on google, thanks for writing this, it was just what I was seeking for!