The Body Mass Index (BMI) is the simple ratio between body mass (kg) and height (m) squared. It is often used in classifications of body proportions and nutritional status (in adults). It is very useful in population terms due to its simplicity. According to the World Health Organization, ideal values ​​are between 20 and 25. Between 25 and 30 refer to overweight; from 30 to 35 to obesity; above 35 to morbid obesity and below 20 to a very thin individual. Body composition is a very important aspect to be taken into account in an assessment of the result - which can be considered by a Physical Education professional.