STYLETHREAD -- LET'S TALK SHOP!

I would like to be doing Day 2 of Week 1, but instead I am trapped in a dress that I cannot unzip, waiting for someone to come home and help me. 

You could create your own circuit. I used to do a circuit of my own when I lived in a larger apartment. I had a jump rope and some stairs, and I would alternate a few minutes of cardio (jumping rope, walking/running the stairs, and jumping up onto one step and then back off) with resistance like push ups, wall push ups, sit ups, lunges, etc. -- very similar to Shred.

I usually did it like this: 1 minute of intense cardio, followed by 20 or so reps of whatever resistance thing I was doing, then 2-3 minutes of less intense cardio, then a minute of intense cardio, then 20 reps of more resistance, then 2-3 minutes of less intense cardio NOT followed by intense cardio, then 20 reps of more resistance, then repeat the whole thing. I varied the intensity of the cardio by running vs. walking stairs, jumping two feet on the rope versus "skipping" etc.

I felt I got a good workout with this, and it's pretty similar. You'd just need to add in the weight component on other days of the week, probably. How heavy are the weights you're using for Shred? That might be another way to amp it up. You could do bicep curls, shoulder presses, tricep raises, etc. in a circuit on the days you don't do a cardio thing.