Running causes the muscles to shorten and stretching helps them re-establish their resting length, so you don't feel stiff afterwards.

跑步过程会使肌肉的长度变短，这种拉伸练习可以帮助肌肉重新恢复至其安静状态时的长度，从而不会使你在练习过后感到肌肉僵硬。

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The length of pen is slightly greater than the width of the control box that it's resting against.

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