Well! I've been running since January and have comfortably been doing 5km and a few longer 10km. Had my first 5km race last week and got a pb of 37 minutes. However I bought a copy of Runner's World magazine a few weeks back and hadn't got round to reading it until the other night. In it was a simple tip that said run with driving your knees forward. So, I tried this on my run yesterday. I was very conscious about it as I it felt very different to however I was running before. I could feel a change in my pace and more of a push from behind, with my legs almost coming up further behind. Extending my knees forward, not up if that makes sense? I could not believe it when I finished and just doing this simple change I knocked five whole minutes off my run!!! I can't work out entirel what I was doing so wrong before, I guess I must have been overpacing somehow and slowing myself down. What a difference though, I was amazed! Such a simple but a huge time difference! It didn't feel any tougher doing it so I assume that is a good thing. I do feel my muscles slightly more today because I was using them slightly differently to before. Has anyone else ever experienced anything like this? Is there anything else I should be looking out for?