I like this workout too. I aimed for the 30 days straight but found after 5 days I became fatigued and wasn't able to use the heavier dumbells I started with on Day 1. I took 2 days off and then did a similar type circuit workout on the third day and feel strong again. I plan to use it regularly but probably no where near 30 days straight! It kind of annoys me that Jillian doesn't make the goals more clear in the intro of the workout. For me I think I tended to go with the biggest loser workout mentality that we must workout daily for hours a day like they portray on the show. I heard Jillian speak somewhere recently about the ideas presented on the show are for "reality show" purposes only and she only recommends about 4 hours a week of exercise to lose weight and get in shape. She herself states she only works out 3 days a week but of course she is maintaining her fitness rather than losing so that probably makes a difference.