... mind you, they don't HAVE to be athletes (not that I mind if they are... LOL)
Catfighting, when "using" celebs, involves a good measure of suspension of disbelief (all within good reason though, I mean, say, Calista Flockhart beating Mary would be a stretch for anyone's imagination LOL).
Also, just because, in Mary's case, a woman is big and muscled-up, doesn't automatically make her a potentially good or tough catfighter (Lyndsey Davenport leaps to mind)... so, the like of, say, Catherine Bell, Brigitte Nielsen (in her prime) ect... could probably well hold their own vs. someone like Pierce, or at least, they LOOK LIKE, they could.
And, my poor little Sylvie, at 5'02" and now in her mid-fourties, it wouldn't take a Chyna to "keep here busy" (LOL)
Thanks for all the suggestions so far !