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Scores of participants gathered at Beijing's Olympic Forest on Feb 26 to take part in an event called the 'Naked Run'.
The event is probably not exactly like what you had in mind, but it is close.
According to Shanghaiist, participants of the annual run don bizarre outfits in bid to promote environmental protection.
Most of them have for some reason chosen to wear revealing running attire.
As you might imagine, the event has produced a fair bit of interesting photos.
Out of the runners, a woman in a bikini seems to have stolen the show.
Many photos show her taking wefies with other participants.
In one of the images, she was 'caught' smiling and enjoying the company of a rainbow-haired male runner.
We will let the photos do the talking from here. Have a look at the woman and other photos from the unusual event in the gallery above.