Ok, here's the deal. Jillians program is no nonsense, it is common snse and straight to the point. Jillian tells you roughly how many calories to eat per day, and if you really want to get great results you can follow her oxidizor plan. There are three oxidizer plans that take into account how each person breaks down different food groups. It's effective beacuse you eat foods that will keep you satisfied for longer you will be less likely to binge and snack. Jillian also provides circuits exercises, these are done four times per week and take about an hour to complete. They include things like puch up, different types of sit ups, bi-cep curls, squats, lunges, and they also include cardio exercises such as jumping jacks and jumping rope. The circuits include cardio portions so that you are toning up and muscle while getting a cardio workout at the same time. You also have to do 1 day per week of cardio of your choice. You can also add extra cardio if you want.
Personally, i love the program. It makes perfect sense, eat less calories, move more to burn more fat.
You mention buying her book, which book is that? There are two, i have them both. The first (Winning by Losing) is the best for losing a faor amount of weight, while her second book (Making the Cut) is best for the last 10- 20 pounds or if you really want to kick start the weight loss, it's pretty intense.
Hope all that helps! If you have any other questions, just post.