mesomorph

A mesomorph is a term from the somatotype theory, originally proposed by William Sheldon in the 1940s. It describes a body type characterized by a naturally muscular and well-proportioned physique. In the original framework, mesomorphs are contrasted with ectomorphs (slender, lightly muscled) and endomorphs (higher body fat, softer contours).

Typical features include broad shoulders, a narrow waist, a high degree of muscle mass, and a rectangular or wedge-shaped torso. The skeleton is often medium to large in size with a strong bone structure. Mesomorphs tend to gain muscle mass and strength relatively easily in response to resistance training and may maintain a moderate to low body fat level when they lead an active lifestyle.

In fitness contexts, mesomorphs are often perceived as having an advantageous starting point for bodybuilding and athletic performance, but individual responses vary widely. With proper training and nutrition, they can gain lean mass efficiently and may see noticeable improvements in strength and physique compared with other body types; however, fat loss or gain depends on energy balance and individual metabolism.

Criticism and modern use: The somatotype model is considered oversimplified by many scientists. People do not fit neatly into discrete categories; genetic, hormonal, and lifestyle factors produce wide variation. Contemporary assessments tend to focus on body composition and functional metrics rather than fixed typologies.

Overall, a mesomorphic tendency is commonly observed among athletes who emphasize strength and power, though it is not a strict predictor of performance or health.