Every time this thread pops up I want to add my 2 cents, but I love almost every one of my Cathe workouts that it is so hard!!
My least favorite is easy:
Circuit Max
Step Blast
Favorite:
High Step Challenge
Crossfire
STS Total Body
Intensity
Cardio Core Circuit
4DS
Push Pull
Terminator Workouts
Entire LIS
I feel like I am neglecting some workouts I really love--like all of the split series workouts. I cannot choose which one of those I like best! Though I am partial to PS and GS. I still have quite a few I still haven't done, too.