Thank you for this product, it's a little more than an 'I own this book, I purchased a kettlebell 12Kg for twenty euros and left me here for less than 50 euros to this activity, combining bodybuilding and fitness in shape. I am a sports Sunday with little problems back, and discipline my procured a wellness and fitness without pain. But it is imperative to read the whole book properly before starting the exercises so that the practice is most effective.