Even if you're not planning to step onto the competition stage anytime soon, well-developed delts can be a game-changer. They create width, which in turn makes your waist look smaller. A great set of shoulders will set you apart from the rest of the crowd, whether you're flexing in front of the judges or relaxing in a T-shirt.
"Many bodybuilders with comparatively narrow proportions have been saved by great deltoid development," says Arnold. This can be true even if you never develop truly broad shoulders. "You don't notice, because [the] deltoids are so thick and fully developed."