Stretching: The Truth (NYTimes 10.31.08)
The old presumption that holding a stretch for 20 to 30 seconds — known as static stretching — primes muscles for a workout is dead wrong. It actually weakens them.
Other studies have found that [static] stretching decreases muscle strength by as much as 30%. Also, stretching one leg’s muscles can reduce strength in the other leg as well, probably because the central nervous system rebels against the movements.
The right warm-up should do two things: loosen muscles and tendons to increase the range of motion of various joints, and literally warm up the body.
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