Attar turned heads in the head-to-toe outfit she patched together with her mother to race in the 800 metres at the 2012 London Games, where she was one of the first Saudi women Olympians.

This time Attar, now 23, will take on the gruelling 42 kilometer (26 mile) marathon race in Rio, where four Saudi women will take part. The women and seven Saudi men arrived in Rio on Monday, but were kept away from prying media.

Gender divisions are so sensitive that the Saudi Olympic Committee website did not name the women who will represent the country. Along with Attar, they are judoka Wujud Fahmi, fencer Lubna al-Omair and 100m runner Cariman Abu al-Jadail.

None qualified directly for their competition, but will take part with special invitations from the International Olympic Committee. Attar has no regrets and no doubts about running in London and Rio.

"I was going for the women in Saudi Arabia, for all the young girls to have someone in the Olympics representing them, giving them a picture of something they could one day strive for," she said in a recent article for the Like The Wind runners' magazine.

Attar finished last in her 800 metres heat in London, more than half a minute behind her nearest rival. She still got a standing ovation when she crossed the line.

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