Hypocaloric diet and physical exercise are the first therapeutic steps in the treatment of obesity. In morbidly obese patients, physical activity is essential to optimise their preparation for bariatric surgery. But physical activity is essential even after surgery, to avoid loss of muscle mass and the deriving complications. The aim of this book is to present the most current evidence of the effect different physical activity programs on morbidly obese patients before and after bariatric surgery. Written by experts in the field, the book will be a useful tool for all health professionals interested in learning more on this disabling condition.