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英文字幕：

Every athlete battles mental barriers. But this Olympian must defeat physical barriers too: all ten of them!

Hi, I'm Dr Greg Wells. Hurdlers are incredible multi-taskers. They have to be. Taking off like they've been shot from a cannon, they must somehow maintain enough control to soar, smoothly, over barriers about a metre high, in rapid succession.

So, how do they pull it off? When most of us run, our femur moves through a small range of motion in the hip socket -and in just one direction. But hurdlers train to move their femurs differently: they have twice the range of motion, and rotate in a circle at the same time!

The secret is a special stomach muscle called the psoas. It runs from your thigh bone, through your stomach, and up your lower back. Hurdlers lengthen and strengthen their psoas muscle. That lets them whip their trail leg through the entire range of motion with incredible speed.

The average person can run 7-10 km/h, but the unique combination of strength and flexibility enables an Olympic hurdler to hit up to 30! The fusion of hip motion and muscle recoil... That's how you leap to gold!

中文字幕：

每位運動員都要克服心理障礙。而這位奧運選手還必須克服實際障礙，共有十個之多。

我是維爾斯博士。跨欄選手是神奇的多面手，他們必須做到。他們起跑猶如炮彈，但又必須保持足夠控制力，才能順暢地越過約一米高的障礙物，一個接一個。

他們是怎么做到的呢？我們跑步時，大腿的股骨在髖臼內(nèi)作小幅度的運動，而且只朝一個方向。但跨欄選手股骨的運動有所不同，活動幅度達(dá)常人兩倍，同時還可以打圓圈。

秘密在于腹部一塊叫腰肌的特殊肌肉。腰肌從大腿骨經(jīng)腹部連到下背部。跨欄選手把腰肌練得更長更強，讓他們的跟進(jìn)腿能以驚人速度，跨出大幅度動作。

一般人跑速是每小時7到10公里，而奧運跨欄選手結(jié)合勁力和靈活度，可以達(dá)到時速30公里。髖部運動加上肌肉回彈，就是奪金之道！

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（Video provided by GE 編輯：Julie）