A common body composition measurement that assesses both fat and lean mass is body mass index (BMI) or more accurately, methods like dual-energy X-ray absorptiometry (DEXA) scans. While BMI provides a general estimate based on height and weight, DEXA offers a precise breakdown of body tissues, distinguishing between fat mass, lean body mass, and bone density. Evaluating body composition is essential for not only assessing health risks but also for tailoring fitness and nutrition strategies to achieve specific body goals.