Excellent book on training in swimming to the attention of all swimmers who wish to control their progress. A structured and progressive program to improve the efficiency of the 4 strokes, suitable for all levels up to competitors. Many explanations and answers to the problems encountered in swimming. Exercises for all strokes. In short a must have. We must also highlight the availability of the author through the forum of the site SWIMMING FOR ALL, where he answers all the questions of the readers.