We know that undefeated UFC champion Ronda Rousey has granite fists.
But now we know she has an iron core too, thanks to a video posted by UFC President Dana White.
She’s coming up against one of the best strikers in the division in former boxer Holly Holm, so she’s going to need to be solid as a rock.
Former Olympic judo medallist Rousey was already honing her striking skills in the run up to her 34-second annihilation of Bethe Correia – but we have been given a taste of how she trains her abs.
We’re not going to lie, it looks nasty – and there’s not a crunch in sight. It’s all functional rolls and twists that will strengthen her core on the ground.
And then there’s the good old-fashioning slamming her in the stomach with a medicine ball.
She’s definitely going to be just as tough to beat on January 2.
.@RondaRousey unique ab workout #DWCOTD pic.twitter.com/WTJlJZS1Pw
— danawhite (@danawhite) August 24, 2015
