mesomorphy

/ˈmɛzəˌmɔrfi/
noun
  1. The quality or state of having a muscular, athletic body type.
    • His high level of mesomorphy meant he could build strength quickly with regular exercise.
    • The study measured mesomorphy in athletes to see how body type affects performance.
    • The trainer explained that mesomorphy is one of three main body types in the somatotype system.