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Ectomorph. Ectomorphs (or ectos for short) are categorized by one word, THIN. The bone structure of an ectomorph is very narrow. This means that ectos usually have a small rib cage, narrow shoulders, and long thinner limbs. An ectomorph will struggle to add both muscle and fat, so adding body weight is usually a slow process. Even though ectomorphs will have difficulty getting bigger and stronger...