Even though they're not DVD's, I do find Cardio Coach workouts really tough. Nothing gets me sweating harder than CC on my elliptical. I don't know what it is about Sean, but he keeps me going full boar without the dread. I burn tons of calories, am a sweaty (soaked) mess, and come close to the puke factor....but I just love him. Except Press Play....I do have a bit of dread with that one, but it's gone as soon as I hear his voice.
If you don't have cardio coach CD's or downloads, I highly recommend them.