Push-ups add more chest muscles, right? Actually, your shoulder width is ok. I am 178, and my shoulder width is about 48. I just finished working out. If I want to widen my shoulders, I need to enlarge my deltoid muscle. There are many ways to exercise my deltoid muscle. If there are dumbbells, I can hold them sideways in front, sideways and upwards. Of course, barbells can also be used.