By John Balson @JJBalson

SPORTY sisters Maria and Valery Bystritskii may look innocent - but they're actually boy-beating CAGE FIGHTERS

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Videographer / Director: Mike Saliba
Producer: John Balson, Nick Johnson
Editor: Sonia Estal

Showtime: Valery Bystritskii, 10, trains with a fellow student at Bunny's Gym

The pair, aged just 11 and 10, enjoy gymnastics, painting and skiing like normal kids, but can also punch, grapple and submit opponents using slick mixed-martial arts manoeuvres.

MMA Family: Sisters Maria (right) and Valery Bystritskii, 11 and 10, with parents Dr Albert Bystritskii, 47, and Elena Koutkina, 44
Sister act: Maria (right) and Valery Bystritskii, 11 and 10, have been training in MMA for a few years

Both are students at Bunny's Gym in Winchester, Tennessee, where children as young as four are taught mixed martial arts or MMA, the sport popularised by the Ultimate Fighting Championship.

Karate kids: Sisters Maria and Valery with mum Elena Koutkina and trainer Bunny Hawkersmith, 59

Surprisingly their parents, Dr Albert Bystritskii, 47, and his wife Elena Koutkina, 44, who have multiple black belts including karate and tae-kwon-do between them, are more than happy for them to train.

Maria, 11, said: "Fighting boys in the cage is kind of weird. They are a little aggressive and get mad if we make them submit."

Role model: The girls' father Dr Albert Bystritskii has black belts in several martial art disciplines.

Valery, 10 adds: "Being in the cage is a little nerve-wracking because you don't know how experienced your opponent will be - but you forget that once you get into it."

Eye of the tiger: Maria Bystritskii prepares for a training match in the cage
Competitions for children are banned in the USA, but it is legal to train children

Dr Bystritskii, an emergency room physician, said: "I think it's important they learn how to protect themselves. You never know when you're going to need something in your life - and it's better to know it and never need it than need it and not know it."

He added: "They are both talented fighters. Maria is calmer and plays defence and likes to let the other person make a mistake and then take advantage. 

Put 'em up: Maria Bystritskii training with another student at Bunny's Gym in Winchester, Tennessee

"Valery is a little faster and a bit more aggressive. She likes to attack and not wait for the other person to come in."

MMA is said to be the fastest growing sport on the planet. 

Fighting fit: And older image of Maria Bystritskii, now 11, who is taking after her parents by learning martial arts
Kid gloves: An older image of Valery Bystritskii, now 10, striking a fighting stance at home

Competitions for children are banned in the USA, but it is legal to train children.

However, some critics have described the sport as 'human cock-fighting' and has led to MMA events being banned in New York State, even for adults.

Despite the controversy, owner of the Bunny's Gym and martial arts expert Bunny Hawkersmith, 59, is quick to defend its merits.

Crunch time: Valery Bystritskii, 10, battling it out in the cage

He said: "I’ve been teaching children for many years and I’ve never had a child hurt in MMA. 

"Some critics say it's like cock fighting but these are people who don't understand the sport and have never trained in it.

Downtime: Outside of MMA the sisters enjoy gymnastics, painting and skiing
Outside the cage: Maria Bystritskii, 10, enjoys other hobbies outside of her MMA training

"We build children's self-esteem and we build up their confidence. A lot of children are shy and they’re scared and they feel like they don’t know what to do if a bully or something had attacked them. 

"But after a few sessions here you see their faces glowing, their chests puffed out and you see the new confidence as they walk around."

Cage match: All training is closely monitored and gym owner Bunny Hawkersmith says they have never had a serious injury

Bunny says all training sessions are closely monitored and children are not made to 'tap out' in submission. 

If a hold is secured and locked without pressure, it counts as a win. They are also not allowed to use strike moves without wearing protective equipment like helmets and gloves.

Legwork: Valery Bystritskii, 10, gets a fellow student into a submission hold using her legs

The club also has a strict policy that MMA techniques are never used outside of the gym and any child caught using them is first given a warning or dismissed if caught a second time.

As his club continues to expand, Bunny has hopes that the children he trains may one day become champions in the adult version.

He said: "Football has pee-wee football, soccer has pee-wee soccer, basketball has pee-wee basketball. Now we have pee-wee MMA and I believe that the MMA stars of tomorrow will be the kids who are the pee-wee stars of today."