I, who had been able to spend my money in other books that have more air ride the trend, "I'm really sluggish" that accompany an effective grip, I was pleasantly surprised by this comprehensive manual . Three performance levels: beginner, intermediate, confirmed ... I started downstairs and went to the means exercises with motivation and attendance ... it's nice to see progress ... And especially to be well do ... Because at least if we follow what is written (with a lot of precision), it will be found not to be foolishly wrong ... motivating to work with such a help! in addition, I learned lots of stuff on the muscles: a real coach on paper ... and little short of money well spent