A body type characterized by a tendency to store fat, have a round or soft body shape, and build muscle easily, according to somatotype theory.
From 'endo-' (within) and 'morph' (form/shape), coined by psychologist William Sheldon in the 1940s as part of his somatotype classification system linking body shape to personality.
Sheldon's endomorph theory was later largely debunked—it turns out body shape and personality aren't linked, and genes plus nutrition matter far more than mysterious constitutional types, showing how science revises old categories.
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