I'm right there with ya Susie! I have done day 1 of week 5 THREE times!! I am finally moving onto day 2 tomorrow (or the next day if work is too crazy).
One thing that has surprised me is that even when I don't think I can make the increase, if I just try, I am able to do it. *of course I still did W5D1 3 times
The fact that this program slowly increases your endurance so that you can do more than you could imagine is one of the things that keeps me coming back for each workout. Another thing is that I have lost 3 3/4 inches in a month!!!!!