I have all of Cathe's kickboxing workouts and I'm trying to remember which one has those roundhouse kicks you describe, but I can't come up with it. Let me know. I just remember the plie squat-jump-roundhouse kicks that Cathe does in a lot of kickboxing workouts.
Anyway CTX Kickbox starts with a kickboxing warm-up, then followed by some combinations, then an imaginary jump rope and power lunges segment, followed by a short segment of kick combinations, then a couple of punching drills (jabs, hooks, uppercuts) then a brief cool down, bicep weight work, ab work, and a stretch.