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Most of us grew up hearing that we should warm up with a stretch. Strike and hold a pose, such as touching your toes, for 30 seconds or more, we were told, and you'll be looser, stronger and injury-proof. 我们是听着这样的告诫长大的：运动前要先做拉伸运动来热身。摆出姿势并保持——比如用手触脚尖——30秒或更久，然后我们的身体就可以变得更柔韧、强壮、不易受伤。 But anyone who follows fitness science — or this column — knows that in recent years a variety of experiments have undermined that idea. Instead, researchers have discovered, this so-called static stretching can lessen jumpers' heights and sprinters' speeds, without substantially reducing people's chances of hurting themselves. 不过，所有关注运动科学（或本专栏）的人都知道，近年来有不少实验都证明，运动前拉伸并不高明。研究者发现，所谓的静态拉伸会让跳高运动员跳得更低、短跑者跑得更慢；而且还不能显著降低运动受伤的风险。 Now, two new studies are giving us additional reasons not to stretch. 现在，又有两个新研究为我们提供了“不要拉伸”的新理由。 One, a study being published this month in The Journal of Strength and Conditioning Research, concluded that if you stretch before you lift weights, you may find yourself feeling weaker and wobblier than you expect during your workout. Those findings join those of another new study from Croatia, a bogglingly comprehensive re-analysis of data from earlier experiments that was published in The Scandinavian Journal of Medicine and Science in Sports. Together, the studies augment a growing scientific consensus that pre-exercise stretching is generally unnecessary and likely counterproductive. | 
