Final answer:
William Sheldon proposed somatotypes linking body types to personality traits, such as ectomorphs being introverted and intellectual.
Explanation:
Ectomorphs, endomorphs, and mesomorphs are the three somatotypes proposed by William Sheldon based on body types. Ectomorphs are thin individuals with specific personality traits like being anxious, self-conscious, artistic, thoughtful, quiet, and private. Examples of ectomorphs are actors Adrien Brody and Nicole Kidman. Sheldon's theory on somatotypes associating body types with personality traits has been discredited in contemporary psychology.
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