Actually, it can slow you down! Why? "Static Stretching" is believed to elongate muscle fibers causing a neuromuscular inhibitory response according to Malachy McHugh, director of research for the Nicholas Institute of Sports Medicine and Athletic Trauma at Lenox Hill Hospital in New York City. Static stretching triggers a protective counter response in the nervous system and this tightens the muscles to prevent from over stretching them. In experiments, static stretching temporarily decreased strength by up to 30% and can last up to 30 minutes. Also in large scale studies, static stretching did not reduce common injuries such as knee pain and Achilles Tendinitis.
There also has been debate as to what is (if any) the best way to warm up your muscles prior to running. If you still feel the need to do a "warm up" prior to running, "dynamic stretching" may be your best option. This type of movement incorporates a wide range of body movements and doesn't stress tissue fibers causing your nervous system to use the protective counter response spoke of prior. Here are some examples of dynamic stretches.
http://www.runnersworld.com/article/0,7120,s6-241-287--13442-0,00.html
Chris
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