Going with JLo here. Even in her mid 50's, where most women start losing there edge as physically, JLo is still as fit and as athletic as they come. I mean any women who can dance like that definitely has the strength and agility to excel as a fighter. Not that I view Katy as a pushover, but I definitely don't see her being on Jlo's level when it comes to physical or even mental toughness.