I already own the book by Mark 'You are your own gym' which is brilliant!. I turned 31 this year and after 2 kids I definitely noticed how my body started to change and how much harder it is to maintain my ideal weight. His explanation on why this happens makes total sense. I was attracted by the book because I simply have no time for gym as I am a full time mum and the idea that I can achieve the body I want in my living room with no equipment sounded great. As I said the book is great, however for me it's so much easier to see once than to read the instructions a thousand times. there is still a chance that I may be doing it wrong. I waited for over 6 months for the UK release and it did not disappoint. I have Mark Lauren in my living room guiding me through all the exercises. They are simple to fallow yet very effective when done correctly. Mark makes you push yourself and puts a great emphasis on form. I have already done a few weeks of the novice program from the book, so found the novice CD too easy so after one week jumped straight to the intermediate which I have done for 2 weeks now. I already feel stronger and slightly more toned in my arms. However do not expect to loose weight unless you also fallow Mark's advice on food you will consume while on this program. The only thing I would mention is that I think is good to have the book so you can change the exercises you do from time to time as it can become too boring doing the same thing for a few weeks in a row, therefore I give it 4 stars. Otherwise simple, no nonsense, easy to fallow exercises and the price is great compared to other high profile exercise DVDs.