When it comes to synonyms for the phrase "feat of strength," there are quite a few options to choose from. Depending on the context, you might consider alternatives like "display of power," "show of force," or "test of might." Other options that convey a similar sense of physical prowess or strength include "spectacle of brawn," "demonstration of muscle," or "display of athleticism." And for those seeking a more poetic or evocative way to describe a feat of strength, consider options like "testament of fortitude," "proof of mettle," or simply "act of heroism." With so many potential synonyms available, it's easy to add depth and nuance to your descriptions of strength and prowess.