It’s Not Much of a Stretch
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Next time you are chasing a PR at a race, you might consider skipping the popular standing quadriceps stretch. 
In a recent study published in the Journal of Strength and Conditioning Research, researchers found that static stretches like these actually decreased leg power. So instead of holding your usual stretches for 30 seconds, opt for more dynamic stretches like lunges or head for a warm-up jog to fire up your muscles.