MMA star Rachael Ostovich ain't lettin' a bun in the oven keep her from getting in a violent workout ... hitting the punching bag while in the third trimester of her pregnancy!!
The 1-0 BKFC fighter and former UFC talent posted a clip of her recent gym session on Tuesday ... rocking a one-piece athleisure 'fit as she threw some jabs at a new addition to her fitness setup.
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"Third trimester ain’t stopping me," Ostovich said on Instagram.