QOTD: Do you stretch either before or after your runs? Does your routine vary for a race?
First, I can add what I've learned from my reading of research articles. Every person is different and you need to find what works best for you. There was a large scale study done that I read a while back that had several experimental groups in it.
1 - Those who stretched
2 - Those who didn't stretch
3 - Those who stretched but were instructed to stop stretching
4 - Those who didn't stretch but were instructed to start stretching
The premise of the study was to determine if one method was more advantageous over the other in prevention of injuries. Off the top of my head (I can't remember specifically) but I believe the stretching was a mixture of dynamic and static. The results were a bit surprising to me. Over the course of a few months, groups 1 and 2's injury rate was the same. However, groups 3 and 4 both had an increase in injury rate over there comparison group (1 and 2) and were similar to each other (3 vs 4).
So, what does this data mean? Like I said, everyone is an individual and you have to find what works best for you. Once you find something that works for you, stick with it. It just so happens the science behind that theory seems to support the idea.
For me, prior to running I usually partake in about 10 minutes of dynamic stretching (leg swings side to side, butt kicks, toy soldier, hacky-sack, butt kicks with arm stretches, and windmills with arms). If my pace is slower than marathon pace, then I just get started. If my pace is marathon pace or faster I usually do a 1.5 mile warm up and 1.5 mile cool down. After running, I usually do 10 minutes of static stretching (toes on stairs, pull leg back like chicken, touch toes with legs together, touch toes with legs apart, touch knee to chest in each direction, touch toes legs apart, touch toes legs together, and then stretch arms upwards). I haven't ever forgotten to do my pre-running stretches so I can't say what it would be like without it, but I know I've forgotten my post-running static stretching and I can tell a huge difference about 18-20 hours later when the fatigue or soreness for yesterday starts to set in.
As for races, I try to follow the same routine. Pre-Running: Dynamic with usually 1-2 miles of easy running (depends on race distance shorter race equals longer or more intense warmup and longer race is easier less distance). Post-running: Static stretching.