If you're strong and athletic, with powerfully developed muscles, you can describe yourself as muscular.

Weight lifters are muscular, and so is the Incredible Hulk. If your grandmother has worked as a cattle farmer her entire life, she is probably pretty muscular too. Anyone with strong muscles can be described as muscular. In the 1600's, the word simply meant "pertaining to muscles," but by the mid-1700's, muscular specifically referred to well-developed muscles. The root word is the Latin musculus, which, oddly enough, means both "muscle" and "little mouse."

Definitions of muscular
  1. adjective
    having a robust muscular body-build characterized by predominance of structures (bone and muscle and connective tissue) developed from the embryonic mesodermal layer
    synonyms: mesomorphic
    having a sturdy and well proportioned body
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    having a build with little fat or muscle but with long limbs
    endomorphic, pyknic
    having a squat and fleshy build
    having a slender physique
    having an (over)abundance of flesh
    lean, thin
    lacking excess flesh
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  2. adjective
    (of a person) possessing physical strength and weight; rugged and powerful
    “a muscular boxer”
    synonyms: brawny, hefty, powerful, sinewy
    having strength or power greater than average or expected
  3. adjective
    of or relating to or consisting of muscle
    muscular contraction”
  4. adjective
    having or suggesting great physical power or force
    “the muscular and passionate Fifth Symphony”
    having great power or force or potency or effect
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