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
Last Modified 106/1998
Copyright (C) 1993-1998
By Bradford D. Appleton