Somatotyping is a classification system that categorizes human bodies into three primary types: ectomorph, mesomorph, and endomorph. Developed by psychologist William Sheldon in the 1940s, this system is based on physical characteristics such as body shape, muscle mass, and fat distribution. Each type is associated with specific traits; for example, ectomorphs are typically lean and slender, mesomorphs are muscular and athletic, while endomorphs tend to have a rounder physique. The purpose of somatotyping is to understand how body types can influence physical performance, health, and personality traits. While it has been used in various fields, including fitness and psychology, critics argue that it oversimplifies human diversity. Despite its limitations, somatotyping remains a popular tool for assessing body composition and tailoring fitness programs.