Describing a person or body type that is naturally thin, lean, and slender with little body fat.
Adjectival form of 'ectomorph,' from Greek 'ekto-' + 'morphe.' Developed alongside Sheldon's somatotype theory in mid-20th century psychology and biology.
Olympic distance runners are typically ectomorphic, and you can see why—their light frames are built for endurance, not for sprinting power!
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