Running Technique was the book I was looking for, I'm only a casual running, but was always getting knee injuries. The running technique book has allowed me to understand what muscles are involved in running and removed a lot of problems I had with my stride. I no longer have knee injuries when I run now that I know what to look for and what I should be doing. Which was really all I really wanted - to run without injury. I can also see that as time goes on I'll be able to get fast and remain injury free which will be brilliant. Thanks Brian.