KPC is my fav video. What I do is mix it up on my own. Let's say I need about 40 minutes of a workout I will do a blend of the warm up, combo #1, combo #2, combo #3 and then the first section of the drills. I follow that with a weight video like Pyramid upper body. The premixes are good, but if you are new to Cathe they might be a little hard. Stick with the combos first and then work up to the drills or when you start the drills do as much as you can and then you can switch to another form of cardio. It does take some time to build up the endurance, but just give it a few weeks and you will master the video in no time.
Good Luck!