I'll be the odd bodkin and put in a plug for Amy's earlier "A-Team Bootcamp". The structure is very similar to Cathe's original Boot Camp and Drill Max, with 6 drill blocks of cardio, leg work, upper body and core. In "A-Team Bootcamp" the cardio drills are two minutes each, which makes 1 to 1-1/2 minute intervals feel like a walk in the park, and a couple in particular (fast football feet interspersed with plyo lunges, AND her flying "curtsy leaps") turned my legs and heart to rubber. Which is just how I like it.
Other than that, I also like the cardio intervals in "Hi/Lo Dome Challenge" (especially her bounding one-footed hops), and the cardio intervals in "Hi/Lo Xtreme" (especially her "football weaves" and her "race runs" - two great low-impact burners) and "Hi/Lo Cardio Knockout".
Because I'm a disaster with choreography I stick with her intervals. That's plenty for me!
A-Jock