What characteristic is associated with mesomorphs?

Mesomorphs are characterized by a muscular and athletic build, which includes a large chest and increased muscle mass. This body type typically has broader shoulders and a narrower waist, resulting in a naturally more powerful physique. Due to their muscular development, mesomorphs often excel in strength-related activities and can gain muscle mass more easily compared to other body types.

The other characteristics described in the options relate more to different body types. For instance, the short neck and round face are commonly associated with endomorphic characteristics, while being tall and having long arms points towards an ectomorphic build. The ability to lose weight easily does not specifically define mesomorphs, as that may apply to ectomorphs who generally have a faster metabolism. Thus, the emphasis on a large chest and more muscles aligns with the fundamental traits of the mesomorphic physique.