Article on Runners World detailing some of the common mistakes runners make that can reduce your performance and happiness when it comes to running.

Boston Marathon 2011
http://www.runnersworld.com/running-tips/10-bad-habits-and-how-to-break-them?cid=soc_Runner%27s%20World%20-%20RunnersWorld_FBPAGE_Runner%E2%80%99s%20World__Running%20Tips