The Kalenjin are .06% of the world's population but they are a unique tribe.卡倫津人佔世界人口的0.06%，但他們是一個獨特的部落。
They are one of the most dominant athletes in the world.
他們是世界上最傑出的運動員之一。
Example Stats:示例資料:
5 American High School runners have broken 4 min mile in all time.
5名美國高中跑步運動員打破了4分鐘一英里的紀錄。
One high school in Betin, Kenya has 4 high schoolers who broke a 4 min mile in the same year.
肯亞貝廷的一所高中有4名高中生在同一年打破了4分鐘一英里的紀錄。
There are 17 men in US history who have run under 2:10 in a marathon.
美國曆史上有17個人在馬拉松比賽中跑過2小時10分鐘。
32 Kalenjin men did this in one year. So why does this specific group of Kenyan men perform so well in distance running?
32名卡倫津人在一年內做到了這一點。那麼，為什麼這群肯亞男子在長跑中表現如此出色呢?
There are a couple of reasons.
這其中有幾個原因。
Some have speculated it is altitude. But there are tons of other tribes, people and nations that live at altitude. That theory is largely ignored.
一些人猜測是海拔問題。但還有很多其他的部落、人民和國家也生活在高原上。這個理論在很大程度上被忽視了。
One reason is the body type that they have.
其中一個原因是他們的體型。
The Kalenjin tribe lives right on the equator. Extremely hot dry climate often cause the body to take a form that has skinnier limbs. Longer limbs create more surface area to enable cooling, which is critical for grueling jogs.
卡倫津部落就住在赤道上。極端炎熱乾燥的氣候通常會導致身體變得四肢更細。較長的肢體可以創造更多的表面積來散熱，這對於高強度的跑步來說是至關重要的。
Having thin legs, in combination with their lighter frame, allows them to use less energy with their strides. This fact has been tested and proven in labs.
瘦長的腿，再加上她們較輕的體型，使得她們邁大步時消耗的能量更少。這一事實已在實驗室中得到驗證。
Lastly, there is a sociological incentive.
最後，還有一個社會學的動機。
In Kalenjin culture, tolerance for pain, hardship, toughness, is a virtue, a sign of manhood. This trait is massively important for distance running training.
在卡倫津文化中，忍受痛苦、吃苦、堅韌，是一種美德，是男子氣概的象徵。這個特點對長跑訓練非常重要。
And over many, many generations, this trait has been promoted and passed down.
經過許多代人的努力，這種特質得到了提升和傳承。
The result:結果是
A group of athletes who have paired their work ethic and mental toughness with a physiological advantage to become the worlds most dominant runners.
一群運動員將他們的職業道德和精神韌性與生理優勢相結合，成為世界上最具優勢的跑步運動員。
A big salute to the Kalenjin tribe.
向卡倫津部落致敬。