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(CNN) -- As one woman in glittering Lycra gently bends her legs backwards over her head, another balances on top, slowly twisting her own limbs into a human pretzel.

They move as one -- a fantastical insect bewitching the Las Vegas crowds in Cirque Du Soleil's legendary stage show, called simply "O."

But despite their ethereal demeanor, each petite performer possesses a rare Herculean strength and snake-like flexibility. And almost all hail from one country: Mongolia.

"When you want a top baseball player, sometimes you look in America. Where we need a contortionist we look to Mongolia," said the show's artistic director, Sandi Croft.

"When they dance they have a natural flexibility, even in their folk dance. It is just part of their culture to have this extra bend in delivery with their movement."

Why Mongolia?

The bright lights of Las Vegas are a long way from the plains of Mongolia, a sparsely populated country bordering China and Russia.

But in the last 70 years, Mongolia has become a breeding ground for the world's top contortionists, who have performed everywhere from Russia's Bolshoi Theater to the Monte Carlo International Circus Festival.

Indeed, while other well-meaning parents around the world might send their little girls to ballet or piano lessons, in Mongolia they're more likely to drop them off at contortion school.

Watch: The art of contortion

While Mongolian contortion has some similarities to ancient folk dances and yoga poses, it was the launch of the State Circus in the 1940s that saw it really take off as a professional art form.

When the contortion school's first official trainer, the now legendary Tsend-Ayush, began performing across the country, she quickly inspired a generation of girls hoping to quite literally mold themselves in her likeness.

One of those children was then-eight-year-old Angelique Janov, now the trainer for Cirque du Soleil's "O."

"We'd never seen anything like Tsend-Ayush before," she said. "It was her combination of strong technical skills and the beautiful way she moved to the music -- she made it look so easy.

"After that, every little girl wanted to be a contortionist."

Child's play

Of course, training to be a contortionist is far from easy. Students as young as five train for around three hours a day, five days a week. They build up their strength, flexibility and balance through various exercises such as handstands, splits, and push-ups.

"My homework was 300 push-ups a day," said 29-year-old Nomintuya Baasankhuu, former contortionist and Arts Program director at the Arts Council of Mongolia.

"It was intense. But by eight years old I could do most of the technical moves -- I was considered a professional."

There are some risks -- Baasankhuu suffered a knee injury after falling from a human tower three meters high. But many contortionists insist that much like any sport, it is safe if done properly.

"Contortion is not dangerous," said 55-year-old Cirque du Soleil trainer Janov. "It's like yoga -- if you're stretching every day you stay young."

Naturally gifted?

Such rigorous training regimes have been a huge factor in the Mongolians' success around the world. But how much of a role does genetics play?

"Some people are naturally more flexible and this is often due to genetics -- if one of our parents is flexible, we're more likely to be flexible too," said Tim Allardyce of the British Osteopathic Association.

"That said, a naturally flexible person would not be able to get themselves into positions that contortionists can without extensive training -- it is only very gradually, over many months and years, that the ligaments and muscles lengthen, allowing the joints to become more mobile."

World of opportunity

For many youngsters in Mongolia, contortion is seen as more than simply a hobby -- it's a golden ticket to the world.

"Mongolian contortion is globally competitive -- today many performers work for Cirque du Soleil and other international circus companies," said Baasankhuu, who also researched the history of Mongolian contortion at the National University of Mongolia.

"That is why so many girls would like to become contortionists and travel around world and make living from it."

So what is it about these mysterious performers that continues to beguile audiences across the world?

Janov perhaps summed up their allure best: "It's the realization that an individual can do things that seem impossible."