Using somatotyping, William Sheldon observed three distinct human body types. Ectomorphs were of medium height with round, soft bodies and thick necks.

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Ectomorphs are actually characterized by being thin, tall, and having a narrow body type. They typically have a fast metabolism and difficulty gaining weight. Sheldon's three body types were ectomorphs, endomorphs (round and soft body types), and mesomorphs (muscular and athletic body types).

Using Somatotyping, William Sheldon Observed Three Distinct Human Body Types