Janet Cromley on stretching:
...a recent study in the Journal of Athletic Training found that pre-exercise stretching doesn't seem to decrease injury and post-exercise stretching doesn't seem to reduce soreness.
That research, an analysis of previous stretching studies, comes on the heels of evidence that stretching can impair performance of explosive moves such as sprints and jumps.
I've read lots of this stuff elsewhere, but this short piece sums it up nicely. And be sure to take note of the hip flexor advice if you have a desk job (I seem to recall stretching your chest is also important if you spend any significant amount of time desk-bound).
