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Back in grade school you were probably taught the importance of warm-up exercises and it’s likely you’ve continued with pretty much of the same routines ever since. Since then, Science has moved on. Researchers now believe that some of the more entrenched elements of warm-up regimens and stretches are not only a waste of time but are actually harmful for you. The old presumption that holding a stretch for 20 to 30 seconds — known as “staticstretching” is by today’s principles, absolutely dead wrong. In fact, it actually weakens them. In a recent study conducted, individuals generated less force from their leg muscles after static stretching than they did after not stretching at all. Other studies have found that this stretching decreases muscle strength by as much as 30 percent. 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. Proper stretches should do two things: loosen muscles and tendons to increase the range of motion of various joints. That’s why it’s so important to stretch in the correct manner.