Here is a yoga instructor who was able to help her brother with his running regime.
With just a simple breathing technique, he was able to greatly extend his running mileage.
In this video, she also gives instructions for several good stretches targeted towards runners.
The breathing technique she teaches, helps to oxygenate the blood more efficiently. Learning to do deep breathing is always a good idea. So many folks in our world today breathe very shallow.
Most runners seem to be subject to the same group of tight leg muscles.
She recommends stretching after running instead of before which makes sense to me. The muscles will be more warmed up, and more conducive to a good stretch. Trying to stretch a cold, tight muscle may be counter productive.