This is a book for beginners, fitness swimmers, non-competitive swimmers, open water swimmers/triathletes, through world-class elite athletes. If you are just beginning or starting up again after some time off this book will help you fit into any level workout or team and give you the nuts and bolts of the sport. It is a must have resource for any adult who swims and coaches. This book also provides workout development and modification which is very important to all levels of athletes. By it's title you are aware of the contents but it is recommended that everyone read the chapter for Masters first and then the chapters that they are interested in for a comprehensive overview. There are many website resources listed for everyone to use answering a variety of questions and providing demonstration video (stroke examples).