coined by William H. Sheldon
and characterized by a lack of fat
. The classic skinny
person with a high metabolism
, unable to gain weight through any means.
Ectomorphs are typically very thin with a flat chest and little muscle. They tend to have a delicate build and have trouble building muscle mass. Other common attributes are stooped shoulders, above average height and a young appearance. Compare with Mesomorph and Endomorph.