Team GB windsurfer Bryony Shaw, skeet shooter Amber Hill and Paralympian long jumper Stefanie Reid will all be going for gold in Rio .
They are backing a campaign to get girls into sport after research revealed many drop out at school after the age of 13 due to ‘body issues’.
They wanted to show powerful bodies are beautiful – and urged young women not to feel ashamed of being physically strong.
Bryony, 32, a bronze medallist at the 2008 Beijing Olympics and current European champion, said: “I would always keep my body concealed when I was growing up and especially at school because I was concerned other kids would say: ‘Oh look at her, she looks like a boy.’
“At my school the cool thing for most of the girls aged 13 or 14 was to opt out of sport and they would feign some illness or a headache to get out of it.
“So I was really going against the grain and I got bullied at school for trying to do well at sport . Sport was seen as something that the boys did, not the girls.
“The girls were meant to skip the PE class and huddle in corners and gossip.”
She admitted training meant her biceps and forearms got stronger and she tried to conceal them under her clothes.
“I would always hide them away because it didn’t make me feel feminine,” she recalled.
“If I was wearing a dress, I would would opt for one with long sleeves.”
Amber, 18, a former BBC Young Sports Personality of the Year , is now one of the world’s best clay pigeon shooters, and will be competing in her first Olympics in Rio.
She said: “Girls at school tend to get to a certain level in sport and then drop out because they don’t want that muscular body change.
“They think that not training or being involved in sport is the right way to go about it.
“Boys outnumber girls by ten to one in competitive shooting. At one press conference a journalist asked me: “Why shooting?
“That’s not a very sexy sport, is it?’ And I replied: ‘Well, I’ll have to make it sexy then.'”
Stefanie, 31, a five-time world record holder who became an amputee after losing the bottom part of her right leg in a boat’s propellors aged 15, said: “I hate the idea of girls not reaching their full potential in sport because they are afraid they won’t be accepted, or that it somehow makes them less feminine.
“I was quite competitive growing up, both in sport and in school .
“The best day of my life was when a rugby ball was put in my hands, and I was told I could be as aggressive as I wanted to on the pitch!”
All three are backing Bluebella lingerie’s BeStrongBeBeautiful campaign.
In a 2012 survey of 1,500 pupils, more than half of school-age girls said their PE lessons at school had put them off doing any exercise at all.
While boys and girls tended to do the same amount of sport until aged 11, after three years at secondary school girls were doing significantly less.
Bluebella chief executive Emily Bendell said: “We have to change the perception that the strong female form is not beautifully feminine.
“It is very depressing that some girls are still giving up sport at school because they don’t want to be labelled a tomboy or a show off.
“Our female athletes have never been more successful, despite many of them obstacles on the way to success. Think what we could achieve with a more positive attitude.”
Bluebella is one of the UK’s fastest growing international lingerie brands.
It was founded by Oxford University graduate Bendell, 34, because she struggled to find luxury lingerie at High Street prices.
