I used to stretch at least twice a day, primarily before and after a run but also on days I didn’t run and still had running injuries (shin splints and calf problems). I stopped stretching (or at least a stretching regimen) completely now and have no problems. I think the best note on stretching is just to keep yourself loose. If you feel like you’re getting stiff, move it around. Trying to push your body into unnatural stretching positions just leaves those muscles more prone to injury.

I think the more appropriate term for stretching should be loosening up.