Florida State researchers have found that stretching before a run makes you about 5% less efficient. Italian researchers have found that toe-touching exercises change the force-transmission properties of muscle fibers and alter brain signals to muscle, reducing exercise efficiency by about 4%. There is insufficient scientific evidence that pre-exercise stretching reduces injury risk.

One of the most commonly quoted sources about stretching and flexibility is:

Stretching and Flexibility
Version: 1.18
Last Modified 10/12/1994
Copyright (C) 1993, 1994
By Bradford D. Appleton

The compete text may be found in many different places on the Internet. One link to the text is at: http://people.bath.ac.uk/masrjb/Stretch/stretching_1.html

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