5 stars (I love this book!) - I am really loving this core workout. It shows alot of great workouts with differents ways to do them. They weren't all the same old same that i have seen in shape magazine. I do agree with others that the binding should be alittle nicer but if you are careful with it like i am, it won't fall apart. I also like the excersize routines at the end of the book. Made it easier to get going without taking the time to find a plan to work whatever muscles i wanted that day. There is a couple all body, a few core, few upper body, lower body and abs and backs. Also the pregnancy was good to know for the future. I think this has a good viarity for people with different skills all the way up to great physical fitness. I still find alot of excersizes challenging 5 stars (A great book for ball resistance traing and stretching A+) - First let me preface that I have been working out on exercise balls for years and truly believe in them as exceptional fitness tools. Even advanced body builders are using the ball to improve core muscle structure and increase metabolism and flexability. This book is exceptional in its approach. The selection of exercises encompass all training levels. Novices can immediately use the book and hard core, experience lifters can also strongly benefit. There are several very useful workouts at the end of the book which I would strongly recommend. I only have two problems with the book. 1. The book itself will fall apart on you in the gym. I wish it were constructed a little better. At least it is not an expensive book. 2. There could have been more descriptive pictures in some of the more advanced, multi-move exercises. I had no problem understanding all of the moves but a beginner may become confused with some of the more complex maneuvers. Other than that, this is a wonderful book. This is the one book to have when it comes to Ball training. 4 stars (Good content, needs better packaging) - I use Lisa Westl... Marlowe -amp- Company :: Swiss exercise balls :: Health&Fitness :: Health & Fitness :: Exercise :: Equipment and supplies :: Diet & Health & Fitness :: Bodybuilding & Weight Train :: Get on the Ball- Develop a Strong- Lean and Toned Body with an Exercise Ball