1) Athletic 2) Muscular 
soft and with little fibrous tissue, but not succulent.
Relating to mesomorphs. ... (05 Mar 2000) ... 
Type: Term Pronunciation: mez′ō-mōrf′ik Definitions: 1. Relating to mesomorphs.
[adj] - (anatomy) having a robust muscular body-build characterized by predominance of structures (bone and muscle and connective tissue) developed from the embryonic mesodermal layer
mesomorphic 1. One of the three classic somatotypes, or body types. Typically speaking mesomorphs are strong and have an athletic build. They can develop and build [muscle] mass without much difficulty and can usually eat without too much fear of gaining weight. 2. Having form, structure, or size average, normal, or intermediate between extremes.
adjective having a robust muscular body-build characterized by predominance of structures (bone and muscle and connective tissue) developed from the embryonic mesodermal layer