muscularize

verb2

1. •
   To increase the size of the muscles.

   • I need to lift weights & muscularize my chest—it's still so sunken in. — 1982
2. •
   To make (something) more masculine, virile, or militaristic.

   • Perhaps the most famous example of this impulse to muscularize Christianity in the early twentieth century was evangelist Billy Sunday. — 2002