The use of anthropometry has been identified as the most appropriate parameter in physical assessment and is fundamental to helping Physical Education professionals diagnose body composition. There are various techniques and methods for assessing body fat, but some require specific equipment which is often expensive and unsuitable for any environment. Recently, the Body Adiposity Index (BAI) was introduced with the aim of estimating body fat percentage in a practical way, using only hip circumference and height measurements. This index is also an alternative method to the Body Mass Index (BMI) for identifying body composition. The importance given to measurements has been reinforced at all ages, especially with regard to body dimensions that can reflect the state of health of an individual or a certain population. For this reason, we are trying to elucidate the two indicators so that we can highlight the benefits of both and better identify the most accurate index at the time of physical assessment.