Firstly thanks to Stephen for bringing this to my attention, there are three very interesting videos available through the following link. It is definitely worth viewing each one and go right through to the credits. The last page before the credits has a very important paragraph that I feel is well worth reading and taking with you. This may apply to you it may not but for me it does highlight that running no matter what your standard requires some consideration to be given to your technique. Equally the benefit of time given to core conditioning will pay dividends in the long run. Using your body efficiently when running and even when walking will prevent injuries. These could be those that come on suddenly or the excessive wear and tear type that develop over time due to poor musculoskeletal mechanics.