What exactly is Foley?
You know all of those sounds you hear in fight scenes? The punches, the kicks, the slaps? When filmmakers film fight scenes, those sounds aren't actually there - the actors don't really hit each other. They have to do those punching/slapping sounds in Foley!
We had to Foley a punch that Volcano Girl gives to Radian -- check out the Foley session here.
Try just listening to the video - doesn't it feel like a real punch?