Stretching before you Run

There are a lot of study's out there on the effect of stretching before a run or after you've warmed up. Some people think it prevents injury, others think it causes injuries. The US Track and Field Association is doing a study on this right now.

This is very interesting to me and I await the results with much interest. I used to stretch extensively before runs and a friend got me out of the habit - and I find my running a little easier. Now I run about a mile/2 km before I stop for 5 minutes and stretch.