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Published 19:40 27 Jun 2014 BST
Updated 07:31 18 Dec 2014 GMT
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"I've been running throughout my pregnancy and I felt really, really good during the whole process.
"I just didn't want to get lapped and be the first person to get lapped in the 800m."
Montano consulted doctors about her plan to run, who helped her map out a training schedule for the event.
Images via EuroSportHealth