Wilkinson, M., & Williams, A. (2003). Too much of a good thing? Why increased joint flexibility may damage your distance performance. Peak Performance, 175, 5-6.

This is a well presented review article that looks at the research covering stretching and its effect on running economy. A number of statements concerning beliefs and theories regarding flexibility are made.

One explanation why a lack of flexibility actually increases running performance is that it reduces energy expenditure by enhancing elastic energy storage and return in the Achilles tendon and calf muscles.

Implication. ". . . while general stretching, designed to maintain existing levels of flexibility and muscle function, should remain an important aspect of every runner's warm-up and cool-down routines, improving flexibility beyond levels normal [natural] for runners is likely to impair rather than improve performance" (p. 6)

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