What I've set up for myself is a rotation of my own:
Mon: PUB
Tues: Core/flex work (Pilates, or core/stretch max)
Wed: PLB
Thurs: Core/flex work (Pilates, or core/stretch max)
Friday: Total body, such as KPC, ME or Boot Camp
Sat: cardio or core/flex work
I've just started it, but hoping to get it to work. You can rotate in the core work however you wish...(or take away a day) Which Cathe's are you trying to work in?