personally, I would combine the wed and thurs workouts into 1. ie do abs + cardio on wed and take thursday off or vice versa. Working out Sunday is okay. it will be different for every person, as everyone has a different amount of "exercise tolerance" before they overtrain. I also like to minimize cardio, and only increase when i feel it is necessary. So far, in my 5 weeks of CKD'ing i have kept my cardio constant and have been losing fat.