There are going to be premixes for the new dvd's that combine the 2 cardios on each dvd. I combine the CTX cardio sections all the time--it's easy for me to do with a multi-disc player, but you could always switch dvd's with a single player--or even repeat some of the cardio sections, the CTX cardio sections are chaptered well & you can do that easily. I hope that helps!
Jeni