You all inspired me to pull my shred DVD out and give it a go again.
Today was day 1 and I wanted to stop before the first circuit was over but I finished it up. I did take a few too many breaks (that may have been a bit too long as well). But I did it.
I plan to go slow this time and alternate it with another simple exercise plan I found online. I anticipate doing the shred about 3 times a week. I've never gone past level 1 and have never completed more than about 15/16 days.