I'm currently going through the "Total Cardio" program on Daily Burn, and it's definitely a challenge. I don't think there's any routine where I can do it 100%, but I do what I can, and it does get a little easier– or perhaps I should say less crazy hard?– every time.
I've heard it said that "That thing you can't do today, will someday be your warmup." I can see how that will become true over time, especially with almost-daily workouts. With Total Cardio as my "new normal," I can see how the stuff I was doing in True Beginner would seem easy by comparison, even though it was quite challenging when I was doing it.
Weird thing is, even though I'm doing cardio, I'm also developing visible muscle at a dramatic rate, like way more than when I was doing straight-up weight lifting. I'm not sure what the story is behind that. I know the weight lifting made me stronger, but as it worked large muscles in isolation (that's kinda the point of weight lifting, after all) it could be that the Daily Burn is also working all the "connecty" muscles, which is creating the effect.