In these last years in which humanity has faced the Covid-19 pandemic, due to the confinement and sedentary lifestyle, the cases of obese people have increased considerably, making it a problem and a priority to focus on finding alternatives for their treatment.according to studies, there is a relationship between physical activity and life expectancy, so that the most physically active populations tend to live longer than the inactive ones. On the other hand, it is a reality that people who exercise regularly have the subjective feeling of being better than before doing it, both from the physical and mental point of view, i.e. they have a better quality of life.The book reflects a review of the last five years about obesity, its causes and effects, as well as its treatment from the School Physical Education.