因为你通过向前延展双臂增加了“杠杆”的长度，你在蝶动时会感觉你的打腿肌肉在做功，这时，你要尽量保持双脚浸于水中以避免溅起水花。

Because you've lengthened the "lever" forward of your chest by extending your arms, you'll feel more thigh muscle in your dolphin, but avoid splash by keeping your feet in the water.

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例如，你可以紧绷你的肌肉去移动一块巨大的岩石，或许你也可以利用大自然的奥秘之一杠杆来撬动它。

For example, you can strain your muscles working hard to move a big rock or you can use one of Nature's secrets and use a lever.

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和非短跑选手相比，短跑运动员较短的跟腱“杠杆”能使拉伸跟腱的肌肉产生的力量高出40%。

Having a short Achilles lever allows the muscles that pull on the tendon to generate as much as 40% more force than the same muscles in a non-sprinter would be able to manage.

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