The state of being very muscular; condition of possessing well-developed muscles.
2007, Gena Showalter, Red Handed‎, page 11Not like the boys at my school, who were still in the early stages of muscledom (not that they'd ever admit it).
1999, John D. Fair, Muscletown USA: Bob Hoffman and the Nanly Culture of York Barbell‎, page 5The resulting feud between Hoffman and the Weiders, where money, power, and ego were at stake, consumed about two decades, as both parties vied for control of muscledom.