In Sheldon's system, human beings can be classified as to body build in terms of three extreme body types: endomorphic, or round, fat type; mesomorphic, or muscular type; and ectomorphic, or slim, linear type.
Answer: Most people are unique combinations of the three body types: Ectomorph, Mesomorph, and Endomorph. Nutritionists, exercise physiologists, and even doctors use this classification system to help design effective, individualized fitness plans.
