Hi Phyllis.
Funny you should mention Christi today. I did her Totally Hot Cardio this morning as a sub for the 45 minute run, and then did coremax 2.
I love her cardio. Very dancy, complex, just a tad less intense than Cathe, imo. Her music choices are the best out there bar none, and she has a great personality. I hope you like her, her new Cardio Collectibles is really good!