PRETTY twins Bryony and Kathryn Frost seemingly have it all - the model girl looks, fine minds, fit bodies and the ability to take part in one of the most gruelling athletic events in the world.

They are every self-respecting marketing manager's dream.

The 18-year-old sisters from Sandown on the Isle of Wight have been plucked from obscurity to feature in a new advertising campaign by a leading sportswear manufacturer and their mirror image good looks are set to net them millions in sponsorship deals.

Kathryn and Bryony - who attended Sandown High School - are ranked first and second respectively in the under-20s 2,000 metres steeplechase. They run 50 miles a week and follow a strict diet of fresh fruit, vegetables and red meat.

Last month the girls got impressive A level results - mostly As and Bs - and they are now taking a year off before university.

Neither has a boyfriend, claiming they are too busy to make such a commitment - instead their hearts and minds are focused on training for the event they love.

Their contract with Adidas to promote the new a3 trainers may have hit the headlines this week - but the girls are managing to keep their designer trainer clad feet firmly on the ground.

Bryony explained: "We're concentrating on running the best we can. We are very focused on what we can achieve.

"We really enjoy athletics and we don't feel we are missing out because we have to do so much training.

"We do have time to go out but we have to be sensible."

Their parents, Richard Frost, 57, and Sheila, 48, both work as teachers. Their sporting daughters were just three years old when they won their first race at a school sports day.

They joined a local athletics club when they were ten and had their first success at the age of 15 when between them they won three gold medals at the Island Games - a mini Olympics for the world's islands - in Gotland, Sweden.

Their personal bests are just short of the 2,000 metres steeplechase UK record and they could soon be giving long-distance runners such as Paula Radcliffe and Kelly Holmes a run for their money. But the steeplechase remains their great love.

Sheila, who spends more than £20,000 a year on kit for the girls and travelling to race events, said: "It would be our dream for them to compete in the Olympics. It is the most important thing to them."

Their first major athletics target is the World Athletics Championships in Helsinki in 2005, but their ultimate dream is to represent Britain in the 2008 Olympics in Beijing.

Kathryn said she and her sister love to watch the games when they are on the television and they long to represent their country in their chosen event.

"It is everyone's dream to be in the Olympics. You always have to have ambition - we are going to do our own thing and try our hardest," she said.

Their new high profile has come as a big surprise to the girls but they are keen to avoid the so-called "Anna Kournikova syndrome" - whose talent on the tennis court has not ultimately matched the media frenzy over her model-girl beauty.

"We hope we can show our talent on the track and that will show we are not just models," said Kathryn.

And Bryony added: "We are concentrating on athletics - it's nice to do modelling and stuff - but we just want to do the best we can."

Jon Deacon, spokesman for Adidas, explained the girls had been chosen because of their talent on the track and their contract was viewed as a long-term involvement.

He was tight-lipped over how much the Adidas deal means to the girls and said that was a private matter - but needless to say all their kit will now be supplied for them.

Mr Deacon said Adidas was sensitive to the needs of the girls and did not want the media glare to put them off their stride.

"We don't want to put too much pressure on them at this early stage.

"We are working with them and we will build with them as they embark on their senior career.

"This is a long-term involvement. They are looking to peak in their mid-20s and so we will develop with them."

Kathryn said: "We have been overwhelmed by all the interest in us.

"We are just two young girls who love running and our dream is to go to the Olympics and win gold.

"We wouldn't care which one of us might win it first. We would just be happy for each other.

"There is no danger of us becoming like Anna Kournikova. Any money we earn will be performance-related.

"We want people to recognise our talent above all."