Mesomorph (noun)

1. A body type characterized by a predominance of muscle and bone over body fat, with a well-defined musculature and a tendency to gain muscle mass easily.
2. A person with a mesomorphic body type.

Origin:

From greek μεσος (mesos) meaning "middle" and μορφή (morphē) meaning "form" or "shape".

Examples:

1. Bodybuilders are typically mesomorphs due to their ability to gain muscle mass easily.
2. He has a mesomorphic body type and can easily maintain muscle mass.
3. The mesomorph is naturally strong and athletic.
4. The mesomorph is able to build muscle mass quickly.
5. The mesomorph is characterized by well-defined muscles.