Which body type classification includes endomorphs, mesomorphs, and ectomorphs?

The classification of body types into endomorphs, mesomorphs, and ectomorphs is known as the somatotype system. This system was developed by psychologist William H. Sheldon in the 1940s and is used to categorize individuals based on their physical characteristics and body composition.

Endomorphs are typically characterized by a higher percentage of body fat and a wider frame, mesomorphs have a more muscular build with broader shoulders and a narrower waist, while ectomorphs tend to have a slim, slender build with little body fat and muscle mass. Understanding these classifications can be beneficial for personal trainers when designing tailored fitness programs that fit individual body types and their respective metabolic responses to exercise and diet.

Other options do not relate to the specific classification of body types. The body mass index is a numerical value derived from an individual's weight and height and does not categorize people into distinct morphological types. Fitness classification focuses more on individuals' fitness levels, and weight categories are usually used in contexts such as competitive sports, particularly for weight-sensitive sports, and do not reflect the inherent characteristics of body composition that define the somatotype system.